Light waves and Sound waves - Physics

Question 1

What is sound?

Answer 1

Sound is any mechanical disturbance from a state of equilibrium.

Question 2

What are light waves?

Answer 2

These are electro-magnetic waves which can travel through a vacuum.

Question 3

What are light rays?

Answer 3

This is a straight-line path by an arrowhead on a straight line. This arrowhead represents the direction of propagation.

Question 4

Sound waves need _______ to be propagated.

Answer 4

mediums

Question 5

Light waves travel through ________(2)

Answer 5

mediums and vacuums

Question 6

What are light beams

Answer 6

These are several light rays put together

Question 7

What are luminous objects?

Answer 7

Luminous objects are light-producing objects or sources of light

Question 8

What are non-luminous objects?

Answer 8

Non-luminous objects are those that do not produce their own light.

Question 9

Give 10 examples of luminous objects

Answer 9

Glowworms
stars
sun
fireflies
an electric bulb
a tube light
the flame in a lamp
a burning candle
a lighted torch
a red hot iron rod.

Question 10

Give 10 examples of non-luminous objects

Answer 10

Planets
coal
a piece of cloth
the moon
furniture
bushes
electric poles
metals
houses
stones

Question 11

Apart from visible light list other six

Answer 11

gamma rays
X-rays
ultraviolet radiation
infrared radiation
radio waves
Microwaves

Question 12

Arrange all electromagnetic spectrums in order of increasing wavelength and increasing energy

Answer 12

Gamma rays < Ultraviolet < Visible light < Infrared < Microwaves

Question 13

Sound is measured in _____.

Answer 13

Decibels

Question 14

What branch of physics deals with sound and waves?

Answer 14

acoustics