A police siren passes you with a frequency of 5000 Hz. Which correctly describes the sound wave after the police car passes you? The speed of sound is 340 m/s.

A. siren wavelength of 0.0068 meters, frequency you hear = less than 5000 Hz

B. siren wavelength of 0.0068 meters, frequency you hear = 5000 Hz

C. siren wavelength of 0.0068 meters, frequency you hear = more than 5000 Hz

D. siren wavelength of 5000 meters, frequency you hear = 5000 Hz

Answer: B

Explanation:

At equilibrium, the rate of the forward reaction is equal to the rate of the reverse reaction, and thus the concentrations of the reactants and products must be constant.

Answer: B

Explanation: I know

Answer:

n, the number of moles of gas is the same

Explanation:

PV = n RT     if    P  and V and T  and R are the same , the n must be the same

n = numer of moles

Answer:

False.

Explanation:

Humans are made of matter too :)

Answer:

Synthesis Reaction

Explanation:

An synthesis reaction is one in which two or more atoms/molecules react to create a different molecule. These reactions follow the general structure: A + B --> AB.

More specifically, this is an addition reaction. An addition reaction occurs when two or more atoms/molecules combine to create a larger molecule. In this case, carbon and fluorine react to form carbon tetrafluoride, a larger molecule consisting of all the reactants.

This is not a decomposition reaction because these reactions involve a molecule breaking down into atoms or simpler molecules. These reactions follow the general structure: AB --> A + B.

This is not a single-replacement reaction because these reactions involve atoms replacing atoms of a different element in a compound. These reactions follow the general structure: A + BX --> B + AX.

Answer:

its true hope this helped :)

Answer: The butterfly effect

Explanation:

Answer:

speed = wavelength × frequency

wavelength = Speed/frequency

wavelength = 2.998 x 10^8 m/s ÷ 6.1 x 10^9 Hz

wavelength = 0.049m

Taking into account the definition of wavelength, frecuency and propagation speed:

The equation that illustrates the relationship between wave velocity, frequency, and wavelength is v = f×λ.

Wavelength is the minimum distance between two successive points on the wave that are in the same state of vibration. It is expressed in units of length (m).

On the other side, frequency is the number of vibrations that occur in a unit of time. Its unit is s⁻¹ or hertz (Hz).

Finally, the propagation speed is the speed with which the wave propagates in the medium, that is, it is the magnitude that measures the speed at which the wave disturbance propagates along its displacement.

The propagation speed relate the wavelength (λ) and the frequency (f) inversely proportional using the following equation:

v = f×λ

All electromagnetic waves propagate in a vacuum at a constant speed of 2,998 x 10⁸ m / s, the speed of light.

Therefore, the previous expression establishes an inversely proportional relationship between the frequency and the wavelength: The higher the frequency, the lower the wavelength and when the frequency is lower, the greater the wavelength.

In summary, the definition of frequency, wavelength and velocity are:

Finally, the equation that illustrates the relationship between wave velocity, frequency, and wavelength is v = f×λ.

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Answer:

During photosynthesis, plants take in carbon dioxide (CO2) and water (H2O) from the air and soil

Answer:

48 000 cm^2

Explanation:

8000      1cm cubes

 each 1 cm cube side is  1 cm^2   and there are six sides to the cube , so each cube has   6 cm^2  surface area

  and there are  8000 of them     8000 * 6 cm^2 = 48 000 cm^2

Answer:

I think the answer should be 147

Explanation:

Answer:

The molarity of 2.0 liters of an aqueous solution that contains 0.50 mol of potassium iodide is 0.25M.HOW TO CALCULATE MOLARITY:The molarity of a solution can be calculated by dividing the number of moles by its volume. That is;Molarity = no. of moles ÷ volumeAccording to this question, 2.0 liters of an aqueous solution that contains 0.50 mol of potassium iodide. The molarity is calculated as follows:Molarity = 0.50mol ÷ 2LMolarity = 0.25MTherefore, the molarity of 2.0 liters of an aqueous solution that contains 0.50 mol of potassium iodide is 0.25M.Learn more about molarity at: brainly.com/question/2817451

Explanation:

Mark me brainliest please!!! I spent a lot of time on this!!

Answer:

the answer to your question is 1.00784 u

molar mass of H₂S

= 2.Ar H + 1.Ar S

= 2. 1,00784 u + 1. 32,065 u

= 34.08068 u

Answer:

Magnesium

Explanation:

At STP

So

Apply Boyles law

Answer:

-22750.5J or -2.28× 10⁴J

Explanation:

q=(75.0g)(4.184J)(27.5°C-100.0°C)

q= -22750.5J

q= -2.28× 10⁴J

Answer:

pH = 6.91

Explanation:

Recall that at 25 °C, we have the relationship:

[tex]\displaystyle \text{pH} + \text{pOH} = 14.00[/tex]

Therefore, the pH of a solution with a pOH of 7.09 is:

[tex]\displaystyle \begin{aligned} \text{pH} + (7.09) & = 14.00 \\ \\ \text{pH} & = 6.91 \end{aligned}[/tex]

Explanation:

[tex]molar \: mass(mg) = 24g. {mol}^{ - 1} mass = 24.3g \\ molar \: mass(h20) = 18g. {mol}^{ - 1} mass = 12g \\ n = \frac{mass}{molar \: mass} \\ n(mg) = 1.01mol wich \: is \: substance \: a\\ n(h2o) = 0.67mol \: which \: is \: substance \: b \\ \frac{ |n|a }{ |n|b } : \frac{a}{b} \\ \frac{1.01}{0.67}: \frac{1}{2} \\ 1.51 > 0.50 \\ therefore \: substnce \: b \: which \: is \: water \: steam \: is \: limiting \: reagent [/tex]

Answer:

E. None of these

Explanation:

We know, By GAS laws,

PV = NRT, where p- pressure, v- volume, n- number of moles, R- gas constant ,and T- temperature

Now, In the question, the number of moles remains the same as the gas is the same. so n is constant so we can compare n before and after a temperature change.

[tex]\frac{P1V1}{RT1}[/tex] = [tex]\frac{P2V2}{RT2}[/tex]

where P1= 1 atm, P2 = 10 atm, V1= 20 mL, T1= 10°C and T2= 100°C

We don't have to worry about the standard units as they are present equally on both the sides and get cut, same goes for R( gas constant)

So putting values, we get

[tex]\frac{1*20}{R*10} = \frac{10*V2}{R*100}[/tex]

Cutting, R on both sides and moving contents to the right so that only V2 is left on the left.

[tex]\frac{1*20*100}{10*10} = V2[/tex]

∴ V2 = [tex]\frac{2000}{100}[/tex]

∴ V2 = 20mL

1 mole of any gas at standard temperature and pressure (273 K and 1 atm) occupies a volume of 22.4 L.

Answer:

A Carbon

Explanation:

The decay rate of the radioisotope on the previous morning at 10 am is 38.7 million decays per second.

The initial mass of the radioisotope is calculated as follows;

N = N₀(¹/₂)^t/h

where;

24 M/s = N₀(¹/₂)^(22/32)

24 M/s = N₀(0.62)

N₀ = (24 M/s)/(0.62)

N₀ = 38.7 M/s

Thus, the decay rate of the radioisotope on the previous morning at 10 am is 38.7 million decays per second.

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Answer:

980,536.2 grams

Explanation:

The mass of a compound is equal to its moles times its molar mass.

The molar mass of PCl3 is 137.33 g/mol

137.33 x 7.14 x 10^3 = 980,536.2

Answer:

False

Explanation:

Based on their pOH values, the difference in [OH– ] concentration between point A and point B is 10^6.

The pH is determined by the concentration of Hydrogen ions [H+]. The higher the concentration of H+ ions, the lower the pH of a substance. If the concentration of H+ is greater than OH-, the material is acidic, i.e. the pH value is less than 7

In this case, the formula for this will be:

[tex]pH= -log[H+][/tex]

So we have:

[tex][OH]= 14-1= 10^{-13}\\[OH] = 14-7=10^{-7}[/tex]

Therefore, the difference in [OH– ] concentration between point A and point B is 10^6.

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Answer: 10^6

Explanation: edge2023

Answer:

what is on the surface of the moon.

Explanation: