Answer:
There are four basic states of matter
List four conditions that may result in the emission of electrons from a conductor.
Answer:
1 Conditions that result in the emission of electrons from a conductor:
Heating the conductor to a suitable temperature
Exposing the conductor to a strong light
Subjecting the conductor to a very high applied voltage
Subjecting the conductor to high-speed electrons from another source
2 Both diodes and triodes influence current flow and contain electrodes. Diodes involve only two active pieces; triodes contain three electrodes within a tube. Current can flow through a diode in only one direction. Diodes tend to act as rectifiers. In a triode, the third electrode is a grid located between the cathode and the anode. A small difference of potential between the grid and the cathode controls the number of electrons that reach the anode. Adjusting the charge on the grid affects the number of electrons that can reach the anode. Triodes tend to act as amplifiers.
3 a Transmitting antenna
b Modulator
c Oscillator
d Microphone
4 a RF amplifier
b Receiving antenna
c Loudspeaker
d Demodulator
e Tuner
5 hue, saturation, intensity/brightness
6 red, blue, green
Explanation
PF right from PF all 6 answers
There are four main ways in which electrons are emitted from the conductor including Thermionic emission, Electric field electron emission, Photoelectric emission, and Secondary emission.
What is a conductor?A conductor is a substance or material which allows electricity to flow through it. In a conductor, the electrical charge carriers, usually electrons or ions or charged particles, move easily from one atom to another atom when the voltage is applied.
Thermionic emission involves large amount of external energy in the form of heat is supplied to release free electrons from the metal.
In the electric field electron emission, electrons are emitted from the metal surface when the metals are placed in a very strong electric field.
During photoelectric emission, light is absorbed by the metals and this provides energy to the valence electrons in the conductor which break their bond with the parent atom and which are then released from the atom.
Valence electrons have kinetic energy, however they don't have enough energy to escape from the atom. During secondary emission, a high-speed electron from the conductor is bombarded with an atom, which provides energy for the valence electrons to break their bonds with their parent atom which are then released from the atom.
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What is the acceleration of a train that takes 22 seconds to go from a speed of 73 kilometers per hour to a speed of 45 kilometers per hour?
The acceleration of a train that takes 22 seconds to go from a speed of 73 kilometers per hour to a speed of 45 kilometers per hour is 0.354 m/s².
What is acceleration?
Acceleration: the rate at which the speed and direction of a moving object vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates.
Even if the speed is constant, motion on a circle accelerates because the direction is always shifting.
Acceleration is a change in velocity divided by a change in time. Given the time of 22 seconds and the distance is 73 kilometers. The speed is 45 k/h
(73 - 45 ) = 28 km / hr
Change in velocity = 7.778 m/s
7.778 m/s / 22 s = 0.354 m/s².
Therefore, the acceleration of a train is 0.354 m/s².
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Answer:
Below
Explanation:
73 km / hr = 20.277 m/s and 45 km/hr = 12.50 m/s
Acceleration = change in velocity / change in time
(12.5 - 20.277) m/s / 22 s = - . 354 m/s^2
( NOTE the negative sign....this is a DEceleration)
Why can you get a shock if you touch a metal doorknob after walking across a wool carpet? (1 Point) You have gained electrons; the doorknob has no electrons. You have gained neutrons; the doorknob has fewer electrons. You have lost electrons; the doorknob has many electrons. You have gained electrons; the doorknob has many electrons.
Why can you get a shock if you touch a metal doorknob after walking across a wool carpet is because you have gained neutrons; the doorknob has fewer electrons. This is further explained below.
What are electrons?Electrons can be defined as a stable subatomic particles with a negative electrical charge that is found in all atoms and serves as the major carrier of electricity in solids.
In conclusion, You have an unbalanced charge, while the doorknob is neutral. you have gained neutrons; the doorknob has fewer electrons.
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178 79 Au is a(n) __
of gold
Answer: No, but yes
Explanation:
EXPLAIN IT
EDGE— Sometimes doctors have difficulty seeing tumors on images of the brain when they are very small. Which form of nanotechnology is most likely to help improve brain imaging?
Dendrimers are the form of nanotechnology is most likely to help improve brain imaging.
What is nanotechnology?Nanotechnology is the near-atomic manipulation of matter to create new structures, materials, and gadgets.
The technique offers scientific improvement in a variety of fields, including medical, consumer goods, energy, materials, and manufacturing.
Dendrites are a kind of nanoparticle that has been studied extensively for a variety of medicinal applications, including medication administration, imaging, and diagnostics in the brain.
Hence,dendrimers are the form of nanotechnology is most likely to help improve brain imaging.
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Answer:
B. Quantum Dots
Explanation:
Nanotechnology with quantum dots allows for better imaging while examining the body.
Why is it important to be careful interpreting absolute ages of clastic sedimentary rocks such as sandstones?
Answer:
You need to be careful when finding the true age of sedimentary rocks to understand its full history.
Explanation:
What did hegel and kant have in common? they both were determined to disprove marxist theory. they both thought that only history could reveal universal truths. they both refused to completely abandon the role of religion in their work. they both believed that perception was an important element in understanding reality.
Answer:
The two philosophers furthermore seem to share the same conception of the conditions of human freedom. For Hegel as well as Kant, a theory of morality and political right devoted to advancing the cause of freedom must require more than just the absence of obstacles preventing the satisfaction of our animal passions.
Explanation:
Hope that help ;)
The magnetic field 0.225 m from a
wire is 4.29 x 10-7 t. how much
current is flowing through the wire?
need asap please will give brainiest
Answer:
i = 0.483 A
Explanation:
B = [tex]\frac{U.i}{2pi*r}[/tex]
So, here the r is 0.225 m
The Magnetic field is 4.29 x [tex]10^{-7}[/tex] t
U. = 4π x [tex]10^{-7}[/tex] x i
4.29 x [tex]10^{-7}[/tex] = (4π x [tex]10^{-7}[/tex] x i) / (2π * 0.225)
Cutting [tex]10^{-7}[/tex]
4.29 = [tex]\frac{4π * i}{2π * 0.225}[/tex]
4π and 2π canceled, left with 2
4.29 = [tex]\frac{2i}{0.225}[/tex]
4.29*0.225 = 2i
0.96525 = 2i
i = [tex]\frac{0.96525}{2}[/tex]
i = 0.482625 A
Rounding to 3 digits after decimal, we get
∴ i = 0.483 A
what is importance of powder painting?
Answer:
It provides a more durable finish than liquid paints can offer, while still providing an attractive finish
What label should mateo place in the marked cell? uses electrical energy provides electrical energy measures electric current controls electric current
The product label which Mateo should place in the marked cell is that it: B. provides electrical energy.
What is a product label?A product label refers to a paper-document which contains information about the chemical elements, nutrients, and other compounds that are present in a product and its function.
In this scenario, the product label which Mateo should place in the marked cell is that this product was designed and developed to provide electrical energy, based on the electrical symbol for battery shown in the image attached below.
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ILL GIVE BRAINLIEST I PROMISE!
Option C, speed of light will increase as the light rays moves from water to air.
What is refraction of light?The refraction of light is the change in speed of light when it moves from one medium to another.
Light travels faster when it moves from a denser medium to a less dense medium while the speed of light decreases when light passes from a less to a more dense medium.
Water is more dense than air, thus speed of light will increase as the light rays moves from water to air.
Option C depicts increase in speed from water to air.
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another word for iron oxide?
Answer:
Hydrated iron(III) oxide, or ferric oxide
Explanation:
Select the correct sentences on the image.
Matthew throws a ball straight up into the air. It rises for a period of time and then begins to drop. At which points in the ball's journey will
be the greatest force acting on the ball?
Answer:
when the ball falls down
Explanation:
because gravity is a very strong Force
Answer:
a
Explanation:a
A 12 v battery produces a current of 25 amps. What is the resistance
Please help me
Answer:
The resistance is 2 ohms
3. The distance from a makeup mirror to C (the radius of curvature) is 70 cm. How far from the mirror
can a person be and still see an upright, magnified image?
The far point from the mirror can a person be and still see an upright, magnified image is focus i.e. 35cm from mirror.
What is radius of curvature?The mirror is made out of a sphere which has its radius called the radius of curvature.
The focal length f is half of the radius of curvature R of the lens.
Given the radius of curvature is 70cm, then focal length will be 70/2 = 35cm.
The makeup mirror is a concave mirror which forms real and upright images. The magnified images are obtained when the object is placed between focus and mirror.
Thus, the far point is focus i.e. 35cm from mirror.
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Ben created the table below to identify the roles of
different parts of the eye.
Part
Role
Cones
provide color visions through three
types of cells
Lens
focuses light to form an
upside-down, virtual image
Iris
adjusts the size of the pupil to
control the amount of light
receives image of the object and
contains cells that detect light
Retina
Which describes Ben's error?
There is a single type of cone cell.
The lens forms a real image.
The iris is a hole through which light passes.
The retina carries the signals to the brain.
Answer:
the answer is The lens forms a real image.
Explanation:
got it right on edge
What type of nuclear reaction is shown in the diagram below? Write 2 - 3 sentences describing what happens in this reaction, where it happens, and how the energy released can be harnessed for use in homes.
This happens at Sun 's inside
The process is called fusionThis denotes to
When two hydrogen nucleus combine to form a single helium nucleus.It releases lots of solar energy which can be used to create electricity
Can someone please answer this, ill give you brainliest Would be very appreciated.
Answer:
Option 2
Explanation:
When something is acidifying on the pH scale, it generally means the pH is decreasing. Hence, the correct option for the question is :
The ocean pH is decreasingOcean acidification means the acidity of the ocean water is increasing
We know according to pH scale
pH<7 is acidicSo
the pH of oxygen is tending to 1 which is most acidic .
Ocean pH is decreasing (B)Two rocks, A and B, are thrown horizontally from the top of a cliff. Rock A has an initial speed of 10 meters per second and rock B has an initial speed of 20 meters per second. How would you describe the time it takes for the rocks to reach the ground and the horizontal distance they travel?
Answer:
i need help
Explanation:
Can Pineapple be on pizza
Answer:
yes quite a few people love eating Pineapple on pizza
Answer:
yes, if you want pineapple be in pizza
is a superheated cloud of gas and dust swirling around a massive object (usually a black hole or neutron star) this cloud can reach incredible speeds and temperatures as gravity causes it to build up more and more friction, eventually releasing x rays.
a. Nebula
c. Accretion Disk
b. Proto-star
d. White Dwarf
A superheated cloud of gas and dust swirling around a massive object (usually a black hole or neutron star) is called an accretion disk. The correct option is c.
What is accretion disk?Accretion disk is a heavy object surrounded by flow of gas, plasma, dust, or particles. The materials surrounding the heavy object orbiting in the gravitational field of the object that loses energy and angular momentum as it slowly spirals inward.
This cloud can reach incredible speeds and temperatures as gravity causes it to build up more and more friction, eventually releasing x rays.
Thus, accretion disk is a superheated cloud of gas and dust swirling around a massive object.
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Identify the products of this single-replacement reaction between sulfuric acid and aluminum. Then balance the equation
___H2SO4 + ___Al → ___ + ___
Answer/Solution
I hope it help.
Aluminium is far powerful and reactive than hydrogen so it will displace H_2 easily.
The reaction becomes
H_2SO_4+Al—»Al_2(SO_4)_3+H_2Balanced reaction
3H_2SO_4+2Al—»Al_2(SO_4)_3+3H_2compare charging by rubbing and charging by sharing
Charging by rubbing needs physical contact, and charging by sharing does not need any contact.
What is the charge?When the matter is put in an electromagnetic field, it has an electric charge, which causes it to experience a force. Similar charges repel each other, whereas dissimilar charges attract each other.
An electrical charge is created when two distinct insulating materials are rubbed together.
Charge sharing is a signal degradation phenomenon that occurs when charges are transferred from one electronic domain to another.
Electrostatics is the phenomenon of charging by rubbing, whereas induction is the phenomenon of charging by sharing.
Hence, charging by rubbing needs physical contact, and charging by sharing does not need any contact.
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Identify the reactants and products in each of the following reactions: sodium +carbon > sodium hydroxide +hydrogen
Answer:
Hydrochloric acid and sodium hydroxide interact, resulting in salt and a release of heat. As we can see, the result of the interaction of two highly aggressive compounds is table salt and water – compounds that are ultimately harmless, even beneficial, to human beings.
Explanation:
Don't forget to mark me brainliest: )
thank you!!!!
Can someone please answer this, ill give you brainliest Would be very appreciated.
Answer:
See below ~
Explanation:
Sun - provides energy that drives the cycleprecipitation - water falling from the skyrunoff - water moving across impervious surfacesseepage - water soaking into the groundevaporation - liquid water becoming a vapor to return to the atmospherecondensation - water vapor returning to liquid formThe answers are
Sun
Provides energy that drives the circle.precipitation
water falling from skyrun off
Water moving across impervious surfacesevaporation
Liquid water becomes vapour to return to the atmosphereseapage
water soaking into the groundcondensation
water vapour returning to liquid formWhat observational fact convinces astronomers that the source of energy in a typical quasar is physically very small?.
Answer:
An extreme redshift of emission lines that indicated high recessional
What does nuclear fission have to do with the birth of stars?
Answer:
Fission is the process by which large nuclei (like Uranium) split apart releasing energy. Fusion is the joining of nuclei to make larger nuclei, with the release of energy. A ball of contracting interstellar gas becomes a star like the Sun when fusion reactions start in its center. Then, we say "a star is born."
Answer: When light element atoms are crushed under enough pressure for their nuclei to fuse, a star is formed. All stars are the consequence of a balance of forces: gravity compresses interstellar gas atoms until fusion reactions begin.
Explanation:
Which statement about Sagittarius A* is true?
A: It is a quasar.
B: It orbits our sun.
C: It is 26,000 light-years away from earth.
D: It is set to subsume the earth in 100,000 years.
Answer:
It orbits our sun is the correct answer
Sagittarius A* is 26,000 light-years away from earth. Hence, option (C) is correct.
What is Sagittarius A*?Sagittarius A* (Sgr A*), a supermassive black hole at the center of the Milky Way Galaxy with a mass equal to four million Suns, is seen in the constellation of Sagittarius. It is a powerful radio source that is a part of the larger Sagittarius A complex.
One of Chandra's largest observing missions to date led to these new discoveries. In order to obtain the first-ever X-ray photos and energy fingerprints of the multi-million degree plasma swirling around Sgr A*, a black hole with around 4 million times the mass of the Sun, Chandra made observations over the course of nearly five weeks in 2012.
Sgr A* is one of the very few black holes in the cosmos where we can really observe the flow of stuff close by, and it is only 26,000 light years away from Earth.
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a racing car has a uniform acceleration of 5 metre per second square what distance will it cover in 10 seconds after the start
will mark as brainlist
Think of a career that is obsolete (no longer exists). Explain why the career is no longer needed.
Answer:
here
Explanation:
Lector
Resurrectionist
Switchboard Operator
Log Driver
milkmen
Lamplighter
Ratcatcher
Pre-radar Listener
ice cutter
human alarm clock
bowling pin setter
