A sound wave is being emitted from a speaker with a frequency f and an amplitude A. The sound waves travel at a constant speed of 343 m/s in air. Which one of the following actions would reduce the wavelength of the sound waves to one half of their initial value? a) increase the frequency to 2 f b) increase the amplitude to 2A c) decrease the frequency to f /4 d) decrease the frequency to f /2 e) decrease the amplitude to A /2
Answer each question and justify your answer in one or two sentences.
Question 1
A sound wave is being emitted from a speaker with a frequency f and an amplitude A. The sound waves travel at a constant speed of 343 m/s in air. Which one of the following actions would reduce the wavelength of the sound waves to one half of their initial value?
a) increase the frequency to 2 f
b) increase the amplitude to 2A
c) decrease the frequency to f /4
d) decrease the frequency to f /2
e) decrease the amplitude to A /2
Question 2
A sound level meter is used measure the sound intensity level. A sound level meter is placed an equal distance in front of two speakers, one to the left and one to the right. A signal of constant frequency, but differing amplitude, is sent to each speaker independently. When the left speaker is turned on the sound level meter reads 85 dB. When the right speaker is turned on the sound level meter reads 65 dB.
Which of the following best represents what the sound level meter will read when both speakers are turned on at the same time?
a) about 85 dB
b) about 65 dB
c) about 150 dB
d) about 75 dB
e) about 113 dB
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