Question # 1

the example of mechanical waves is

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Water waves

Infrared waves

Radio waves

Ultraviolet waves

In order to produce beats, the two sound waves should have.

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The same amplitude

Slightly different amplitude

The same frequency

slightly different frequencies.

When the amplitude of a wave is increase to doubled is energy.

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Remain the same

Increases 4 times

Increases by two times

Decreases by half

The periodic variations of sound between maximum and minimum loudness are called.

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Doppler's effect

reflection

Laplace correction

Beats

The distance between the consecutive nodes is

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In which medium the speed of sound is greater.

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Oxygen

Air

Water

copper

When two waves of same frequency travel in opposite direction, the phenomenon will be

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Diffraction

Stationary waves

Polarization

Interference

The profile of periodic waves generated by a source executing S.H.M is represented by a.

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Circle

Sine curve

Tangent curve

Cosine curve

If 20 waves passes through he medium in 2 sec of 10 ms-1 then he wavelength is.

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200 m

2 m

1 m

0.5 m

The waves used in radar speed trap are

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Longitudinal

Sound wave

Micro waves

Matter waves

An oscillating mass-spring system produces

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Sound waves

Electromagnetic waves

Light waves

Periodic waves

Teh speed of sound in air is 340 m/s. If the pressure of air is doubled then the speed becomes.

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Double

Half

Four times

Remains same

Light waves are

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Longtail waves

Transvers waves

Stationary waves

Mechanical wave

A set of frequencies which are multiples of the fundamental frequency are called.

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Doppler effect

Nodal frequencies

Beat frequencies

Hamonics

In stationary waves the points which always remain at rest are.

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Nodes

Antinodes

Crest

Trough

When sound waves enter in different medium, the quantity that remains unchanged is.

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Intensity

Speed

Frequency

Wave length

Increase in speed of sound for 1 ^oC rise in temperature is.

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0.61 ms-1

0.61 cms-1

61 ms-1

6.1 ms-1

According to Newton's formula, the speed of sound in air at STP is

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332 ,ms-1

340 ms-1

350 ms-1

280 ms-1

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