The intensity level due to two waves of the same frequency in a given medium are 1 bel and 5 bel. Then the ratio of amplitudes is :

(1) 1 : 4

(2) 1 : 2

(3) 1 : 104

(4) 1 : 102

Concept Questions :-

pressure wave in sound
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Of the following the one which emits the sound of a higher pitch is :

(1) Mosquito

(2) Lion

(3) Man

(4) Woman

Concept Questions :-

pressure wave in sound
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

A point source emits sound equally in all directions in a non-absorbing medium. Two points P and Q are at distances of 2m and 3m respectively from the source. The ratio of the intensities of the waves at P and Q is :

(1) 9 : 4

(2) 2 : 3

(3) 3 : 2

(4) 4 : 9

Concept Questions :-

Energy of waves
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Two waves having sinusoidal waveforms have different wavelengths and different amplitudes. They will be having :

(1) Same pitch and different intensity

(2) Same quality and different intensity

(3) Different quality and different intensity

(4) Same quality and different pitch

Concept Questions :-

pressure wave in sound
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The ends of a stretched wire of length L are fixed at x = 0 and x = L. In one experiment, the displacement of the wire is ${y}_{1}=A\mathrm{sin}\left(\pi x/L\right)\mathrm{sin}\omega t$ and energy is E1, and in another experiment its displacement is ${y}_{2}=A\mathrm{sin}\left(2\pi x/L\right)\mathrm{sin}2\omega t$ and energy is E2. Then :

(1) E2 = E1

(2) E2 = 2E1

(3) E2 = 4E1

(4) E2 = 16E1

Concept Questions :-

Energy of waves
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

In the experiment for the determination of the speed of sound in air using the resonance column method, the length of the air column that resonates in the fundamental mode, with a tuning fork is 0.1 m. when this length is changed to 0.35 m, the same tuning fork resonates with the first overtone. Calculate the end correction :

(1) 0.012m

(2) 0.025m

(3) 0.05m

(4) 0.024m

Concept Questions :-

Standing waves
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Difficulty Level:

Two identical stringed instruments have a frequency 100 Hz. If the tension in one of them is increased by 4% and they are sounded together then the number of beats in one second is :

(1) 1

(2) 8

(3) 4

(4) 2

Concept Questions :-

Beats
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Difficulty Level:

The difference between the apparent frequency of a source of sound as perceived by an observer during its approach and recession is 2% of the natural frequency of the source. If the velocity of sound in air is 300 m/sec, the velocity of the source is : (It is given that velocity of source << velocity of sound)

(1) 6 m/sec

(2) 3 m/sec

(3) 1.5 m/sec

(4) 12 m/sec

Concept Questions :-

Doppler effect
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Two whistles A and B produce notes of frequencies 660 Hz and 596 Hz respectively. There is a listener at the mid-point of the line joining them. Now the whistle B and the listener start moving with speed 30 m/s away from the whistle A. If the speed of sound be 330 m/s, how many beats will be heard by the listener :

(1) 2

(2) 4

(3) 6

(4) 8

Concept Questions :-

Beats
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

A source producing the sound of frequency 170 Hz is approaching a stationary observer with a velocity of 17 ms–1. The apparent change in the wavelength of sound heard by the observer is (speed of sound in air = 340 ms–1

(1) 0.1m

(2) 0.2m

(3) 0.4m

(4) 0.5m

Concept Questions :-

Doppler effect