EWT | Academic Question

Questions
Question (1)
QN0038623

When a wave is reflected from a denser medium, the change in phase is

  • (A)

    0

  • (B)

  • (C)

  • (D)

Correct Answer: D
Explanation:

On reflection at a denser medium, change of phase  (radian)

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Question (2)
QN0038624

A progressive wave  is reflected by a rigid wall at . Then the reflected wave can be represented by

  • (A)

  • (B)

    ) 

  • (C)

  • (D)

     

Correct Answer: D
Explanation:

for the wave progressing along the -axis and for the reflected wave, .

But the position of the rigid wall is at .

For the given wave, its reflected wave

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Question (3)
QN0038625

A string is clamped at both the ends and it is vibrating in its  harmonic. The equation of the stationary wave is . The length of the string is: (All quantities are in SI units.) 

  • (A)

  • (B)

  • (C)

  • (D)

Correct Answer: B
Explanation:

Given,

So  and

or 
Now, using

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Question (4)
QN0038626

Which of the following changes at an antinode in a stationary wave? 

  • (A)

    Density only

  • (B)

    Pressure only

  • (C)

    Both pressure and density

  • (D)

    Neither pressure nor density

Correct Answer: D
Explanation:

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Question (5)
QN0038627

Consider the three waves  and  as           

Which of the following represents a standing wave?   

  • (A)

  • (B)

  • (C)

  • (D)

Correct Answer: A
Explanation:

Standing waves are produced when two waves propagate in opposite direction As  are propagating in +ve -axis & -ve -axis so,  will represent a standing wave.

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Question (6)
QN0038628

A string fixed at both ends is vibrating in two segments. The wavelength of the corresponding wave is

  • (A)

  • (B)

  • (C)

  • (D)

Correct Answer: C
Explanation:

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Question (7)
QN0038629

If vibrations of a string are to be increased by a factor of two, then tension in the string must be made

  • (A)

    half

  • (B)

    four times

  • (C)

    twice

  • (D)

    eight times

Correct Answer: B
Explanation:

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Question (8)
QN0038630

The fundamental frequency of a closed end organ pipe is . Its length is doubled and radius is halved. Its frequency will become nearly

  • (A)

  • (B)

  • (C)

  • (D)

Correct Answer: A
Explanation:

Frequency does not depend upon radius. As length is doubled, fundamental frequency becomes half.

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Question (9)
QN0038631

The fundamental frequency of an organ pipe is . If its length is increased, then frequency will

  • (A)

    decrease

  • (B)

    increase

  • (C)

    remains same

  • (D)

    cannot be predicted

Correct Answer: A
Explanation:

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Question (10)
QN0038632

What is the effect of increase in temperature on the frequency of sound produced by an organ pipe?

  • (A)

     increases

  • (B)

    decreases

  • (C)

    no effect

  • (D)

    erratic change

Correct Answer: D
Explanation:

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