Question # 1

Diffraction is a special type of.

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Polarization

Interference

Dispersion

Scattering

operation of a LASER depends upon

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Spontaneous emission of radiation

The existence emission of radiation

The existence of atoms in normal state

The existence of atoms in metastable state

The energy transported by a wave is proportional to the square of the.

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Wavelength of the wave

Period of the wave

Amplitude of the wave

Frequency of the wave

The ratio of the velocity of sound in hydrogen to the velocity of sound in oxygen is

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4:1

16:1

2:1

8:1

When mas of a string is increased 4 times its original valve, the velocity of the wave.

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Becomes double

Reduces to one half

Reduces to one fourth

Increases 4 times to its original value

Light waves can be polarized because they

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have short wavelength

Have high frequency

Can be reflected

Are transverse

Maximum number of orders available with a grating is.

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Independent of grating element

Directly proportional to grating element

Inversely proportional to grating element

Directly proportional to wavelength

X-rays travels ins straight line with velocity

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Less than light

Greater than light

Equal to light

Equal to sound

Wave length of a LASER can be sued as a standard of.

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Angle

Time

Length

Temperature

The phenomenon of beats takes place due to

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Longitudinal waves

Transverse waves

Stationary waves

Both a and b

The maximum displacement from the undisturbed position of the medium to the crest top is called.

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Wavelength

Amplitude

Period

Frequency

The loudness of a sound deepness on its

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Wavelength

Frequency

Wave amplitude

Regularity

In a spectrometer experiment monochromatic light is incident normally on a diffraction gratin having 4.5 x 10⁵ lines per metre The second order line is seen at an angle of 30^o to The normal What is the wavelength of the light.

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430 nm

556 nm

589 nm

625 nm

Hearing damage is possible at sound pressure of

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0 dB

50 dB

130 dB

195 dB

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

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0.61 m s-1

1.61 m s-1

2.00 m s-1

61.0 m s-1

In the experiment of production of X rays the anti cathode should be bombarded with.

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A particles

Beta particles

Electrons

Protons

When wind blows in the same direction in which the sound travels, the sound velocity

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Decreases

Increases

Remains unchanged

Becomes zero

Sound wave in air are

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Longitudinal waves

Transvers waves

Electromagnetic waves

Matter waves

If a wave vibrates 10 times in one second with a speed of 10 m s-1 the wavelength will be.

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1 m

10 m

20 m

100 m

With which factor disputative power of a grating increases.

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Order of spectrum

Number of lines per centimeter

Order and number of lines per centimeter

Shape of the grating

A light beam is said to be plane polarized when

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its vibrations are restricted to only one plane

Its vibrations are very strong in one plane

Its vibrations take place in any plane

Its vibrations are very weak in one plane

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