Alpha Question Bank for Medical: Physics>Chapter 20 - Wave Motion on a String>Exercise-1>Q 140

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In the $n^{th}$ normal mode of vibration of a string, there are

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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 141

A string is stretched between fixed points separated by

75 cm

. It is observed to have resonant frequencies of

420 Hz

and

315 Hz

. There are no other resonant frequencies between these two. Then, the lowest resonant frequency for this string is

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Alpha Question Bank for Medical: Physics>Chapter 20 - Wave Motion on a String>Exercise-1>Q 142

In a stationary wave represented by

y = a \sin (ω t) \cos (k x)

, amplitude of the component progressive wave is

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Alpha Question Bank for Medical: Physics>Chapter 20 - Wave Motion on a String>Exercise-1>Q 143

A sonometer wire when vibrated in full length has frequency

n

. Now, it is divided by the help of bridges into a number of segments of lengths

l_{1}, l_{2}, l_{3}, \dots

. When vibrated, these segments have frequencies

n_{1}, n_{2}, n_{3}, \dots

. Then the correct relation is

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Alpha Question Bank for Medical: Physics>Chapter 20 - Wave Motion on a String>Exercise-1>Q 144

Two coherent monochromatic light beams of intensities

I

and

4 I

are superimposed. The maximum and minimum possible intensities in the resulting beam are :

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Alpha Question Bank for Medical: Physics>Chapter 20 - Wave Motion on a String>Exercise-1>Q 145

Two coherent monochromatic light beams of intensities

I

and

4 I

are superposed. The maximum and minimum possible intensities in the resulting beam are

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Alpha Question Bank for Medical: Physics>Chapter 20 - Wave Motion on a String>Exercise-1>Q 146

The phase difference between incident wave and reflected wave is

180 °

when light ray :

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Alpha Question Bank for Medical: Physics>Chapter 20 - Wave Motion on a String>Exercise-2>Q 1

A light pointer fixed to one prong of a tuning fork touches a vertical plate. The fork is set vibrating and the plate is allowed to fall freely. Eight complete oscillations are counted when the plate falls through

10 cm

, then the frequency of the fork is

(g = 9.8 m s^{- 2})

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Alpha Question Bank for Medical: Physics>Chapter 20 - Wave Motion on a String>Exercise-2>Q 2

Two speakers $A$ and $B$ , placed $1 m$ apart, each produce sound waves of frequency $1800 Hz$ in phase. A detector moving parallel to line of speakers distant $2.4 m$ away detects a maximum intensity at $O$ and then at $P .$ Speed of sound wave is

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