hawleyemily
21.05.2020 •
Physics
Doing the same amount of work in less time requires more power.
O A. True
O B. False
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Ответ:
true
Explanation:
Ответ:
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.