Oscillations and WavesWave Motion (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 1  5 of 7
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Passage
Sound from a point isotropic source spreads equally in all directions in homogeneous medium. Therefore its intensity decreases with square of distance from the source. When distance between observer and the source changes, apart from changes in intensity, the observer listens sound of pitch higher or lower than actual pitch depending upon the fact that the distance between the observer and source is decreasing or increasing respectively. An observer O is at a distance 2R from center of a circle of radius R. A point isotropic sound source S moves on the circle with uniform angular velocity . Initially observer, source and Centre of the circle are in same line.
Question number: 1 (1 of 2 Based on Passage) Show Passage
» Oscillations and Waves » Wave Motion
Question
During a complete round trip of star on the circle, the observer listens a sound, whose 
Choices
Choice (4)  Response  

a.  Wavelength first increases to a maximum value then decreases to the original value 

b.  Wavelength first decreases to maximum value then increases to the original value 

c.  During the first half time wavelength increases then decreases to the original value 

d.  Question does not provide sufficient data or is vague 

Question number: 2 (2 of 2 Based on Passage) Show Passage
» Oscillations and Waves » Wave Motion
Question
Starting from initial moment, the source moves through an angular displacement 180°. Intensity of the sound as observed by the observer decreases by a factor of –
Choices
Choice (4)  Response  

a.  9 

b.  4 

c.  2 

d.  3 

Question number: 3
» Oscillations and Waves » Wave Motion
Question
A tuning fork makes 256 vibrations per second in air. When the velocity of sound is 330 m/s then wavelength of the tone emitted is
Choices
Choice (4)  Response  

a.  0.89 m 

b.  1.11 m 

c.  0.56 m 

d.  1.29 m 

Question number: 4
» Oscillations and Waves » Wave Motion
Question
A wave travelling in positive Xdirection with A = 0.2m has a velocity of 360 m/sec. If λ = 60m, then correct expression for the wave is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 5
» Oscillations and Waves » Wave Motion
Question
The equation of a plane progressive wave is given by . The frequency of this wave would be,
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

