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

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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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Important Questions on Waves

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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:

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Physics Crash Course NEET>Chapter 11 - Waves>Level 1>Q 44

A string under a tension of

129.6 N

produces

10 beats s^{- 1}

when it is vibrated along with a tuning fork. When the tension in the string is increased to

160 N

, it sounds in unison with the same tuning fork. Calculate the fundamental frequency of the tuning fork.

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Physics Crash Course NEET>Chapter 11 - Waves>Level 1>Q 45

When a guitar string is sounded with a

440 Hz

tuning fork, a beat frequency of

5 Hz

is heard. Let the experiment be repeated with a tuning fork of

437 Hz

. Then, the beat frequency is found to be

8 Hz

. What is the string frequency (in

Hz

)?

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Physics Crash Course NEET>Chapter 11 - Waves>Level 1>Q 46

A maximum of beats produced by two tuning forks of frequency $250 Hz, 256 Hz$ is observed just now by a stationary observer. Now, find how much time should the observer wait to observe the next maximum: