Jack, an Investigator, wants to prove that a certain suspect was present at the crime scene when the crime was committed. What kind of
evidence should he look for?


Jack should look for __________ evidence because the analysis of such evidence can prove whether the person was present when the crime
was being committed. This evidence refers to tiny fragments of material that can be transferred from a human to a human or human to a
location
(forensic science question)

Answer:

60 hours

Explanation:

18.0 __15__ 9 __15__ 4.5 __15__ 2.25 __15__ 1.125g

15(4)= 60

Sodium-24 has a half-life of approximately 15 hours. If only one-eighth of the sodium-24 remain , then it has been passed in 60 hours. So option D is correct.

The time required for half of the original population of radioactive atoms to decay is called the half-life. The relationship between the half-life, T₁ ÷ 2, and the decay constant is given by T₁/2 = 0.693/λ

According to radioactive decay law, the rate of decay of radioactive atoms at any instant is directly proportional to the number of atoms present at that instant.

dtd N ∝ N

dtd N = λ N

where, N is number of integrated nucleus present in the sample at any time t and λ is decay constant.

Thus ,option D 60 hours is correct.

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Answer:

Nitrogen

Explanation:

Nitrogen has 5 Valence Electrons.

And its atomic mass is also less than Bismuth.

There are other elements in the 5th row but this one has the lowest atomic mass compared to the others.

Answer: When we represent a chemical reaction in terms of words, we write a word equation. For example, when hydrogen gas reacts with oxygen gas to form water, we can write a word equation for the reaction as follows: hydrogen + oxygen→ water To the left of the arrow, we have the 'before' situation.

Explanation:

Answer:

1.8 cm

Explanation:

To measure length, use a metric ruler. It is separated into centimeter-sized units. One centimeter is represented by each number on the ruler. The longest mark is the centimeter.

A metric scale is used to quantify traits or variables. Interval scales, ratio scales, and absolute scales are all grouped under the phrase “metric scale.”

The majority of statistical calculations and comparisons are possible with quantitative numerical values.

To the nearest tenth of a centimeter (0.1 cm), a metric ruler, for instance, may measure length. Using a separate metric ruler, you can measure lengths to the nearest 0.05 centimeters (0.05 cm).

The measurement with the lowest degree of uncertainty (0.05 cm) is more accurate.

Therefore, 1.8 cm is the length of the blue line in centimeters.

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For example, salts of sodium, potassium and ammonium are usually soluble in water. Notable exceptions include ammonium hexachloroplatinate and potassium cobaltinitrite. Most nitrates and many sulfates are water-soluble

Answer:

Explanation:

Answer:

frequency

Explanation:

The number of wavelengths that pass through a fixed point in a second is called the frequency of the wave. It has the unit of Hertz. Hence, option C is correct.

The term that refers to the number of wavelengths that pass a fixed point in a second is frequency.

Frequency is a fundamental concept in wave motion and is defined as the number of complete cycles of a wave that occur per unit time. For example, the frequency of a sound wave is measured in hertz (Hz) and is equal to the number of sound wave cycles that occur per second.

The higher the frequency of a wave, the more cycles occur in a given period of time. Wavelength, on the other hand, refers to the distance between two adjacent points on a wave that are in phase with each other, such as the distance between two crests or two troughs.

Wavelength and frequency are related, and the frequency of a wave is inversely proportional to its wavelength. As the frequency of a wave increases, its wavelength decreases.

Amplitude refers to the maximum displacement of a wave from its equilibrium position, while compression is a region in a longitudinal wave where the particles are close together. Hence, option C is correct.

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Answer:

a is occured after d i think

Answer:

radioactive

Explanation:

becasue i said so. Periodt

Answer:

An unstable isotope emits some kind of radiation, that is it is radioactive.

Explanation:

Answer:

Solution and the liquid state

Explanation:

Edge2020

Answer: oil

The answer is A, oil. Oil is one of the most popular fossil fuels. You probably did not know the answer was fossil fuels. The answer is oil.

Hope this helps you!

Answer:

Explanation:

boiling

According to the forces of attraction, boiling takes place when the kinetic energy of molecules overcomes the intermolecular forces.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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Answer:

there is about 6 zeros in 1,000,000

Answer:

6   0's

Explanation:

happy bday #LibraGurl

Answer:

Explanation:

It remains the same!

Answer: 83.68 J

Explanation:

1 cal=4.184 J

1×20=4.184×20

20cals=83.68 J

Answer:

8;1

Explanation:

eight nitrogen and one oxygen

Answer:

Because the density of water is one

Answer:

Solid, Liquid, and Gas!

Explanation:

Answer: When you turn a light on it becomes bright :)

In electrical wiring, a light switch is a switch most commonly used to operate electric lights, permanently connected equipment, or electrical outlets. Portable lamps such as table lamps may have a light switch mounted on the socket, base, or in-line with the cord. Manually operated on/off switches may be substituted by dimmer switches that allow controlling the brightness of lamps as well as turning them on or off, time-controlled switches, occupancy-sensing switches, and remotely controlled switches and dimmers. Light switches are also found in flashlights, vehicles, and other devices.

Answer:

Single displacement (Substitution)

Explanation:

Global warming is the long-term heating of Earth's climate system observed since the pre-industrial period (between 1850 and 1900) due to human activities, primarily fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth's atmosphere

Answer:

Isotopes of any given element all contain the same number of protons, so they have the same atomic number (for example, the atomic number of helium is always 2). Isotopes of a given element contain different numbers of neutrons, therefore, different isotopes have different mass numbers.

The atomic size of an element significantly depends on the number of protons. It is the characteristic property of isotopes that they possess the same number of protons which is responsible for the same atomic size.

Isotopes may be defined as one of two or more species of atoms of a chemical element that have the same atomic number and location in the modern periodic table with identical chemical behavior but with different atomic masses and physical properties.

In a more simple sense, isotopes are those elements that have the same atomic number but different atomic mass. The atomic number depends on the number of protons which remains constant in isotopes. So, the isotopic elements have identical atomic sizes.

Therefore, the isotopes of the same element have the same atomic size.

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Answer:

Yes, acetaminophen is conductive in water.

Explanation:

Have a nice day!

Acetaminophen is conductive in water and it is electrochemically active. It is used as an antipyretic drug.

Acetaminophen is an organic compound containing the amine functional group. One of the most popularly prescribed analgesic and antipyretic medications, acetaminophen (AC), is thought to be both effective and safe.

AC is not poisonous or harmful when used rationally, but an overdose or continued use may cause nephrotoxicity and severe hepatotoxicity. As a result, AC monitoring is crucial for drug safety.

Various conductometric measurements reported the fair conductivity shown by acetaminophen in water. The intermolecular interaction of acetaminophen in water make it conductive.

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Answer:

true

Explanation:

Answer: false, gases can be more easily compressed than liquids.

Explanation: They're easier to compress because there's much more empty space between the gas particles.

Answer:

every mole of anything contains Avogodro's number of atoms.  So: 6.08x10^23 x 3.33 = ?

Explanation:

Answer:

in volume in weight and distibution

Explanation:

Answer:

A) Glycerol

Explana

Answer:

What is your body made of? Your first answer may be that it is made up of different organs like the heart, lungs, and stomach, which work together to keep it going. Or you could go even closer and say that it is made of many types of cells. However, at the most basic level, your body — and indeed, all life, like everything that is not alive — is made up of atoms, often organized into larger structures called molecules

Explanation:

Answer:

Nucleus is the answer of your question

Answer:

nucleus is your awnser