Oscillations and Waves (NEET (NTANational Eligibility cum Medical Entrance Test) Physics): Questions 175  178 of 195
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Question number: 175
» 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 

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Question number: 176
» Oscillations and Waves » Standing Waves in Strings and Organ Pipes
Question
A source of sound placed at the open end of a resonance column sends an acoustic wave of pressure amplitude P _{0} of the tube. If the atmospheric pressure is P _{A}, then the ratio of maximum and minimum pressure at the closed end of the tube will be,
Choices
Choice (4)  Response  

a. 


b. 


c. 


d.  Question does not provide sufficient data or is vague 

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Question number: 177
» Oscillations and Waves » Beats
Question
A source of sound of frequency 256 Hz is moving rapidly towards a wall with a velocity of 5 m/s. The speed of sound is 330 m/s. If the observer is between the wall and the source, then the beats heard per second will be,
Choices
Choice (4)  Response  

a.  7.76 Hz 

b.  3.9 Hz 

c.  Zero 

d.  7.06 Hz 

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Question number: 178
» Oscillations and Waves » Beats
Question
Two whistles A and B produces notes of frequencies 500 Hz and 530 Hz respectively. There is a listener at the midpoint of the line joining them. Now the whistle A and the listener are started moving with speed 30 m/s away from the whistle B. If speed of sound be 330 m/s, how many beats will be heard by the listener?
Choices
Choice (4)  Response  

a.  18 

b.  19 

c.  17 

d.  20 

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