When in air, a waterproof speaker emits sound waves that have a frequency of 1000 Hz.
Part A
When the speaker is lowered into water, does the frequency of the sound increase, decrease, or remain the same?
A) The frequency increases.
B) The frequency decreases.
C) The frequency remains the same.
Part B
When the speaker is lowered into water, does the wavelength of the sound increase, decrease, or remain the same?
A) The wavelength increases.
B) The wavelength decreases.
C) The wavelength remains the same.

A. When the speaker is lowered into water: A) The frequency increases.

B. When the speaker is lowered into water: A) The wavelength increases.

Explanation:

Sound, which is a mechanical wave, travels faster in solids than in liquids, and faster in liquids than gases. This is because the speed of the mechanical waves varies depending on the medium through which the waves travel.  

So, if the speaker is initally in air and then is lowered into water, this means the speed of sound has increased.

On the other hand, the speed of sound is defined as the wavelength times the frequency :

As we can see, if the speed increases, then the wavelength and the frequency increases as well.

Hence:

A. When the speaker is lowered into water: A) The frequency increases.

B. When the speaker is lowered into water: A) The wavelength increases.

answer: the rock sample is a sedimentary rock.

explanation:

it is given that:

mass of rock sample, m = 2.7 g

volume of rock sample,

so, density of rock sample will be

since, the density of rock sample is . hence, the rock sample is a sedimentary rock, whose densities varies between .