Question # 1

When an observer moves towards a stationary source with a speed equal to 1/5 timesof speed of sound, the percentage increase in the frequency of sound is:

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20%

40%

5%

10%

Where in standing wave, do the vibrations of the medium occur?

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Only at the nodes

Only at the antinodes

At all points between the nodes

At all points between the antinodes

Which one is the case when the wavelength is actually changed?

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When source move relative to observer

When observer move relative to source

When observer moves around a stationary source at the center of circle

When the relative displacement between source and observer is zero

With the propagation of longitudinal waves through a material medium, the quantitiestransferred in the direction of propagation are:

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Energy, momentum and mass

Energy and momentum

Energy and mass

Energy

In closed end organ pipe, the frequency of first harmonic is 300 Hz. The frequency ofthird overtone is :

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900 Hz

1500 Hz

2100 Hz

600 Hz

The frequency of an open pipe is f. if one end is closed then its fundamental frequencywill be:

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f/2

3f/4

f

2f

The wavelength of light observed on the earth, form a moving star is found todecrease by 0.05%. Relative to the earth the star is

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moving away with a velocity of 1.5 x 10⁵m/s

moving away with a velocity of 1.5 x 10⁴m/s

coming closer with a velocity of 1.5 x 10⁵m/s

coming closer with a velocity of 1.5 x 10⁴m/s

A closed organ pipe and an open organ pipe have their first overtone identical infrequency. Their lengths are in ratio

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3:4

1:2

2:3

3:5

When passes from medium to another, deviate from its path is called

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reflection

refraction

diffraction

transmission

The fundamental frequency of a closed organ pope is 50 Hz. The frequency ofsecond over tone is

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100hz

150hz

60hz

250hz

A sonar depth finder in a boat uses sound signals to determine the depth of water. Fourseconds after the sound leaves the boat it returns to the boat because of reflection fromthe bottom. Assume the speed of sound in water is 1,460 meters per second. The depth of the water is, in meters, :

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2,200

4,800

4,400

2,920

If source and observer are moving towards each other with same speed and aftercrossing they are receding each other then frequency observed by observer:

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Decreases

Remains constant

Increases

First Increases then decreases

A longitudinal sinusoidal wave has wavelength of 1cm and a period of 2sec. Its wavevelocity is:

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50 cm/ sec

0.5 cm/ sec

5 m/ s

0.005 m/ sec

A progressive sound wave is a means of transferring energy. A progressive sound waveof constant frequency is generated in air. The intensity of energy transfer is directlyproportional to another of the wave parameters. Which of the following is correct?

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Intensity 𝖺 (𝑎𝑚𝑝𝑙𝑖𝑡𝑢𝑑𝑒)²

Intensity 𝖺 (𝑝𝑒𝑟𝑖𝑜𝑑𝑖𝑐 𝑡𝑖𝑚𝑒)²

Intensity 𝖺 (𝑠𝑝𝑒𝑒𝑑)²

Intensity 𝖺 (𝑤𝑎𝑣𝑒𝑙𝑒𝑛𝑔𝑡ℎ)²

The maximum wavelength of a transverse wave that can be set up in a string of length Lis

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L

2L

V

4L

A stationary wave is established in a string which vibrates in four segments at afrequency of 120 Hz. Its fundamental frequency is:

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15Hz

60Hz

30Hz

430Hz

When temperature increases, frequency of organ pipe:

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Decreases

Remains the same

Increases

Becomes zero

A whistle is revolved with high speed in a horizontal circle of radius R. to an observer at the centre of the circle the frequency of the whistle will appear to be:

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Decreasing

Increasing

Both

Constant

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