Question

1.The human ear canal is about 2.3 cm long. If it is regarded as a tube open at one end and closed at the eardrum, what is the fundamental frequency around which we would expect hearing to be most sensitive?
?kHz

2. An airplane traveling at half the speed of sound emits a sound of frequency 5.30 kHz.

(a) At what frequency does a stationary listener hear the sound as the plane approaches?
? kHz

(b) At what frequency does a stationary listener hear the sound after the plane passes?
?kHz

3.A piano string having a mass per unit length equal to 4.50 ✕ 10⁻³ kg/m is under a tension of 1,400 N. Find the speed with which a wave travels on this string.
? m/s

4.A hammer strikes one end of a thick aluminum rail of length 6.58 m. A microphone located at the opposite end of the rail detects two pulses of sound, one that travels through the air and a longitudinal wave that travels through the rail. (The speed of sound in air is 343 m/s.)

(a) Which pulse reaches the microphone first?

the pulse traveling through the aluminum railthe pulse traveling through the air     

(b) Find the separation in time between the arrivals of the two pulses.
? ms

Answer 1