Oscillations and WavesDoppler Effect in Sound (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 11  15 of 16
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Question number: 11
» Oscillations and Waves » Doppler Effect in Sound
Question
An observer is moving away from source of sound of frequency 500 Hz. His speed is 33 m/s. If speed of sound is 330 m/s, then the observed frequency is
Choices
Choice (4)  Response  

a.  140 Hz 

b.  121 Hz 

c.  130 Hz 

d.  110 Hz 

Question number: 12
» Oscillations and Waves » Doppler Effect in Sound
Question
The speed of sound in air at a given temperature is 350 m/s. An engine blows whistle at a frequency of 1200 cps. It is approaching the observer with velocity50 m/s. The apparent frequency in cps heard by the observer will be
Choices
Choice (4)  Response  

a.  2400 

b.  1400 

c.  1050 

d.  600 

Question number: 13
» Oscillations and Waves » Doppler Effect in Sound
Question
The source producing sound and an observer both are moving along the direction of propagation of sound waves. If the respective velocities of sound, source and an observer are V, V _{s} and V _{O}, then the apparent frequency heard by the observer will be,
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 14
» Oscillations and Waves » Doppler Effect in Sound
Question
An observer is moving away from source of sound of frequency 100 Hz. His speed is 33 m/s. If speed of sound is 330 m/s, then the observed frequency is
Choices
Choice (4)  Response  

a.  90 Hz 

b.  91 Hz 

c.  100 Hz 

d.  110 Hz 

Question number: 15
» Oscillations and Waves » Doppler Effect in Sound
Question
A whistle giving out 450 Hz approaches a stationary observer at a speed of 33 m/s. The frequency heard by the observer in Hz is
Choices
Choice (4)  Response  

a.  409 

b.  517 

c.  429 

d.  500 
