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Gamma Question Bank for Engineering Physics>Chapter 14 - Waves>Assignment Set-2>Q 9

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An isotropic point source $' S'$ of sound emits constant power. Two points $A$ and $B$ are situated at distance $x$ and $2 x$ from $S .$ The difference between the loudness of points $A$ and $B$ is about $(\log 2 \approx 0.3)$

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Important Questions on Waves

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Gamma Question Bank for Engineering Physics>Chapter 14 - Waves>Assignment Set-2>Q 10

Figure shows a snapshot for a travelling sine wave along a string. Four elemental portions

a, b, c

and

d

are indicated on the string. The elemental portion which has maximum potential energy is/are
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Gamma Question Bank for Engineering Physics>Chapter 14 - Waves>Assignment Set-2>Q 11

The ratio of intensities between two coherent sound sources is

4 : 1 .

The difference of loudness in

d B

between maximum and minimum intensities when they interfere in the space is

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Gamma Question Bank for Engineering Physics>Chapter 14 - Waves>Assignment Set-2>Q 12

A wave moves with a certain speed in a stretched string. The percentage change in tension required to increase the velocity by

1 %,

is approximately

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Gamma Question Bank for Engineering Physics>Chapter 14 - Waves>Assignment Set-2>Q 13

The equation of standing wave in a stretched string is given by

y = 5 \sin (\frac{π x}{3}) \cos (40 π t)

, where

x

and

y

are in

cm

and

t

in second. The separation between two consecutive nodes is (in

cm

)

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Gamma Question Bank for Engineering Physics>Chapter 14 - Waves>Assignment Set-2>Q 14

Which of the following characteristics of sound help us in identifying two persons talking in a room without seeing them ?

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Gamma Question Bank for Engineering Physics>Chapter 14 - Waves>Assignment Set-2>Q 15

The string of a violin has a fundamental frequency of

440 Hz .

If the violin string is shortened by one fifth, its fundamental frequency will be changed to

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Gamma Question Bank for Engineering Physics>Chapter 14 - Waves>Assignment Set-2>Q 16

A stretched string is fixed at both its ends. Three possible wavelengths of stationary wave patterns that can be set up in the string are

90 cm, 60 cm

and

45 cm .

The length of the string may be

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Gamma Question Bank for Engineering Physics>Chapter 14 - Waves>Assignment Set-2>Q 19

Which of the followings represent the variation of frequency $(f)$ with radius of cross section of a stretched string?

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An isotropic point source'S' of sound emits constant power. Two points A and B are situated at distance x and 2x from S. The difference between the loudness of points A and B is about (log2≈0.3)

Important Questions on Waves

Learn and Prepare for any exam you want !

An isotropic point source $' S'$ of sound emits constant power. Two points $A$ and $B$ are situated at distance $x$ and $2 x$ from $S .$ The difference between the loudness of points $A$ and $B$ is about $(\log 2 \approx 0.3)$