When a string is divided into three segments of lengths l 1 , l 2 and l 3 the fundamental frequencies of these three segments are ν 1 , ν 2 and ν 3 respectively. The original fundamental frequency ν of the string is

1 ν = 1 ν 1 + 1 ν 2 + 1 ν 3

A travelling harmonic wave is represented by the equation y x , t = 10 - 3 sin 50 t + 2 x , where x and y are in meter and t is in seconds. Which of the following is a correct statement about the wave?

The wave is propagating along the negative x -axis with speed 25 m s - 1

The wave is propagating along the positive x -axis with speed 25 m s - 1

The wave is propagating along the positive x -axis with speed 100 m s - 1

The wave is propagating along the negative x -axis with speed 100 m s - 1

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The energy per unit area associated with a progressive sound wave will be doubled if

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Important Questions on Wave Motion on a String

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Alpha Question Bank for Medical: Physics>Chapter 20 - Wave Motion on a String>Exercise-1>Q 21

$S_{1}, S_{2}$ are two coherent sources (having initial face difference zero) of sound located along $x -$ axis separated by $4 λ$ where $λ$ is wavelength of sound emitted by them. Number of maxima located on the elliptical boundary around it will be:

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Alpha Question Bank for Medical: Physics>Chapter 20 - Wave Motion on a String>Exercise-1>Q 22

An interference is observed due to two coherent sources $A$ and $B$ separated by a distance $4 λ$ along the $y -$ axis where $λ$ is the wavelength of the source. A detector $D$ is moved on the positive $x -$ axis. The number of points on the $x -$ axis excluding the points, $x = 0$ and $x = \infty$ at which maximum will be observed is-

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Alpha Question Bank for Medical: Physics>Chapter 20 - Wave Motion on a String>Exercise-1>Q 23

When a sound wave is reflected from a wall, the phase difference between the reflected and incident pressure wave is:

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Alpha Question Bank for Medical: Physics>Chapter 20 - Wave Motion on a String>Exercise-1>Q 24

A sound wave of frequency

660 Hz

is incident normally at reflecting wall then the minimum distance from the wall at which particle's amplitude will be maximum (velocity of sound

= 330 m s^{- 1}

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Alpha Question Bank for Medical: Physics>Chapter 20 - Wave Motion on a String>Exercise-1>Q 25

The frequency of a fork

A

3 %

more than the frequency of a standard fork whereas the frequency of fork

B

3 %

less. The forks

A

and

B

produce

6

beats per second. The frequency of standard fork will be

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Alpha Question Bank for Medical: Physics>Chapter 20 - Wave Motion on a String>Exercise-1>Q 26

A tuning fork produce 2 beats when sounded with one oscillator of frequency

514 Hz

, and produces 6 beats with the other oscillator of frequency

510 Hz

. The frequency of tuning fork is:

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Alpha Question Bank for Medical: Physics>Chapter 20 - Wave Motion on a String>Exercise-1>Q 27

26

tuning forks are arranged in a line having beat frequency of

4

between two successive tuning forks. If frequency of last tuning fork is

3

times that of

1 st

tuning fork, then find the frequency of

1 st

tuning fork,

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Alpha Question Bank for Medical: Physics>Chapter 20 - Wave Motion on a String>Exercise-1>Q 28

Two vibrating tuning forks produce waves given by

y_{1} = 4 \sin 500 π t, y_{2} = 2 \sin 506 π t

. If they are held near the ear of a person, the person will hear

The energy per unit area associated with a progressive sound wave will be doubled if

Important Questions on Wave Motion on a String

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