Question

a) A=7, B=2

a) Consider a pipe with a length of (A+32.5) cm. If the temperature of the air is (12.5+B) ^oC and the pipe is closed in one end and open in the other, what is the frequency of the third harmonic for the pipe? Post your answer in hertz (Hz) and with 3 significant figures.

b) A=2, B=7

b) Consider a string with a length of (47.5 +A) cm tied at both end (like on a stringed instrument). If the frequency of the first harmonic on the string is (245+B) Hz, determine the speed of the wave in the string. Post your answer in m/s and with 3 significant figures.

c) A=5, B=2

c) You heard the sound of a distant explosion (3.50 + A/10) seconds after you saw it happen. If the temperature of the air is (15.0 + B) ^oC, how far were you from the site of the explosion? Post your answer in meters (m) and with 3 significant figures.

d) A=32

d) Consider a sound with an intensity of (2.45 + A) x 10^-6 N/m². Calculate the decibel level for this sound. Post your answer in decibels (dB) and with 3 significant figures.

Threshold of hearing, I_o = 1.00 x 10^-12 N/m².

Answer 1