Unit 2 (Sound and light)

All the following are factors affecting sound intensity except ……….

• Amplitude

• Frequency

• Density of medium

• Wind direction

The quantum of energy of green light is …………. quantum of energy of yellow light.

• less than

• greater than

• equal to

Sound of frequency 200Hz is …………. than the sound of frequency 100 Hz.

• sharper

• harsher

• stronger

• weaker

The absolute refractive index of water is …………

• 0.8

• 0.5

• 0.32

• 1.33

When incident light ray falls perpendicular on the interface surface , the angle of incidence equals…………..

• 90

• 30

• 60

• Zero

The human ears can distinguish sounds of frequency …….. Hz

• 50 kHz

• 30 kHz

• 300 kHz

• 50 Hz

X = …….. degree

In ………….. reflection, the reflected rays are reflected in many directions.

• Regular

• Irregular

• Uniform

• Both regular and irregular

Find the number that refers to angle of refraction

Which medium (A) or (B) is greater in optical density