Question 1

A certain source of sound waves radiates uniformly in all directions.At a distance of 20 m from the source the intensity level is 51 db.What is the total acoustic power output of the source,in watts? (Note: The reference intensity I₀ is

Accepted Answer

The answer of A certain source of sound waves radiates...

Question 2

A 0.25-m string,vibrating in its sixth harmonic,excites a 0.96-m pipe that is open at both ends into its second overtone resonance.The speed of sound in air is 345 m/s.The common resonant frequency of the string and the pipe is closest to

Accepted Answer

A)  540 Hz. 
B)  360 Hz. 
C)  450 Hz. 
D)  630 Hz. 
E)  700 Hz.

Question 3

A woman is riding a bicycle at 18.0 m/s along a straight road that runs parallel to and right next to some railroad tracks.She hears the whistle of a train that is behind.The frequency emitted by the train is 840 Hz,but the frequency the woman hears is 778 Hz.Take the speed of sound to be 340 m/s.
(a)What is the speed of the train,and is the train traveling away from or toward the bicycle?
(b)What frequency is heard by a stationary observer located between the train and the bicycle?

Accepted Answer

The answer of A woman is riding a bicycle at...

Question 4

In a resonating pipe that is open at both ends,there

Accepted Answer

A)  are displacement nodes at each end. 
B)  are displacement antinodes at each end. 
C)  is a displacement node at one end and a displacement antinode at the other end. 
D)  None of the above are possible.

Question 5

A 1.30-m long gas column that is open at one end and closed at the other end has a fundamental resonant frequency 80.0 Hz.What is the speed of sound in this gas?

Accepted Answer

A)  104 m/s 
B)  61.5 m/s 
C)  26.0 m/s 
D)  246 m/s 
E)  416 m/s

Exam 16: Sound and Hearing

A certain source of sound waves radiates uniformly in all directions.At a distance of 20 m from the source the intensity level is 51 db.What is the total acoustic power output of the source,in watts? (Note: The reference intensity I0 is

A 0.25-m string,vibrating in its sixth harmonic,excites a 0.96-m pipe that is open at both ends into its second overtone resonance.The speed of sound in air is 345 m/s.The common resonant frequency of the string and the pipe is closest to

In a resonating pipe that is open at both ends,there

A 1.30-m long gas column that is open at one end and closed at the other end has a fundamental resonant frequency 80.0 Hz.What is the speed of sound in this gas?

A certain source of sound waves radiates uniformly in all directions.At a distance of 20 m from the source the intensity level is 51 db.What is the total acoustic power output of the source,in watts? (Note: The reference intensity I₀ is