Gamma Question Bank for Engineering Physics>Chapter 14 - Waves>EXERCISE 14.2>Q 10

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When the temperature of a gas at temperature $T$ is increased by $400 K$ , the velocity of gas becomes $\sqrt{2}$ times the initial value at temperature $T$ . The value of $T$ is

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Important Questions on Waves

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Gamma Question Bank for Engineering Physics>Chapter 14 - Waves>EXERCISE 14.2>Q 11

The displacement $(y)$ and time $(t)$ graph for two sound waves is shown in figure. The ratio of their intensities is

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Gamma Question Bank for Engineering Physics>Chapter 14 - Waves>EXERCISE 14.2>Q 13

If the sound level at a point

10 m

from the point source is

20 dB

, then the sound level at distance

20 m

from the same source will be about

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Gamma Question Bank for Engineering Physics>Chapter 14 - Waves>EXERCISE 14.2>Q 18

Four sources of sound each of sound level

10 dB

are sounded together in phase, the resultant intensity level will be

(\log_{10} 2 = 0.3010)

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Gamma Question Bank for Engineering Physics>Chapter 14 - Waves>EXERCISE 14.3>Q 19

A uniform string fixed at both ends is vibrating in

3^{rd}

harmonic and equation of vibration is

y = 4 (cm) \sin [(0.8 {cm}^{- 1}) x] \cos [(400 π s^{- 1}) t]

The length of the vibrating string is

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Gamma Question Bank for Engineering Physics>Chapter 14 - Waves>EXERCISE 14.3>Q 24

A pipe closed at one end produces a fundamental note of

412 Hz

. It is cut into two pieces of equal length, then the fundamental notes produced by the two pieces are,

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Gamma Question Bank for Engineering Physics>Chapter 14 - Waves>EXERCISE 14.3>Q 27

A tuning fork of frequency

500 Hz

is sounded on a resonance tube. The first and second resonances are obtained at

17 cm

and

52 cm

. The velocity of sound is,

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Gamma Question Bank for Engineering Physics>Chapter 14 - Waves>EXERCISE 14.3>Q 28

A longitudinal sound wave given by,

p = 2.5 \sin \frac{π}{2} (x - 600 t)

, where

t

is in second, is sent down a closed organ pipe. If the pipe vibrates in its second overtone, the length of the pipe is,

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Gamma Question Bank for Engineering Physics>Chapter 14 - Waves>EXERCISE 14.5>Q 41

25

tuning forks are arranged in series in the order of decreasing frequency. Any two successive forks produce

3

beats per second. If the frequency of the first tuning fork is the octave of the last fork, then the frequency of the

21^{st}

fork is,