Physics Crash Course NEET>Chapter 11 - Waves>Level 1>Q 35

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The correct figure that shows, schematically, the wave pattern produced by the superposition of two waves of frequencies $9 H z$ and $11 H z$ , is

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Important Questions on Waves

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Physics Crash Course NEET>Chapter 11 - Waves>Level 1>Q 36

A closed organ pipe and an open organ pipe of same length produce

2 beats \sec^{- 1}

when they are set into vibrations together in fundamental mode. The length of open pipe is now halved and that of closed pipe is doubled. The number of beats produced will be

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Physics Crash Course NEET>Chapter 11 - Waves>Level 1>Q 37

Two sound waves with wavelengths

5.0 m

and

5.5 m

, respectively, each propagates in gas with velocity

330 m s^{- 1}

. The number of beats that can be expected from them per second is

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Physics Crash Course NEET>Chapter 11 - Waves>Level 1>Q 38

Two vibrating strings '

A

' and '

B

' produce beats of frequency

8 Hz

. The beat frequency is found to reduce to

4 Hz

if the tension in the string

' A'

is slightly reduced. If the original frequency of

A

is

320 Hz

, then the frequency of

B

' is

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Physics Crash Course NEET>Chapter 11 - Waves>Level 1>Q 39

A source

X

of unknown frequency produces

8

beats \sec^{- 1}

with a source of

250 Hz

and

12

beats \sec^{- 1}

with a source of

270 Hz .

The frequency of the source

X

is (in

Hz

)

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Physics Crash Course NEET>Chapter 11 - Waves>Level 1>Q 40

Two waves of wavelength

2 m

and

2.02 m

, respectively, moving with the same velocity superimpose to produce

2 beats \sec^{- 1}

. The velocity of the waves is,

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Physics Crash Course NEET>Chapter 11 - Waves>Level 1>Q 41

A tuning fork produces

4 beats s^{- 1}

with another tuning fork

B

of frequency

288 Hz

. If the fork is loaded with little wax, the number of beats per second decreases. The frequency of the fork

A

before loading is,

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Physics Crash Course NEET>Chapter 11 - Waves>Level 1>Q 42

Two sources have frequencies

256 Hz and 258 Hz

. Then, the time difference between two consecutive maxima is,

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Physics Crash Course NEET>Chapter 11 - Waves>Level 1>Q 43

Two vibrating tuning forks produce progressive waves given by

y_{1} = 4 \sin 500 π t

and

y_{2} = 2 \sin 506 π t .

Number of beats produced per minute is: