Question

A singer sings a note into a microphone. Which of the parts of the wave would be affected by the microphone and how?
A) D, the frequency would get higher.
B) C, the wavelength would get longer.
C) C and D, the amplitude and wavelength would increase.
D) A, B and D. The amplitude and crest would be higher, while the trough would be lower.

Answer 1

D) A, B and D. The amplitude and crest would be higher, while the trough would be lower.

Answer 2

The microphone increases the amplitude. So the correct answer is A, B and D. The amplitude and crest would be higher, while the trough would be lower.