Waves

Question 1

Define waves?

Answer 1

Series of vibrations produced by regular disturbance

Question 2

Why are waves important?

Answer 2

Waves carry energy from one place to another

Question 3

Types of waves?

Answer 3

1.Transverse waves
2.Longitudinal waves

Question 4

Define longitudinal waves?

Answer 4

The direction of energy transmission is parallel to the wave motion

Question 5

Define transverse waves?

Answer 5

The direction of energy transmission is perpendicular to the wave motion

Question 6

Property of transverse waves?

Answer 6

The wave has a crest and trought

Question 7

Property of longitudinal waves?

Answer 7

The wave has compression and expansion

Question 8

Examples of transverse waves?

Answer 8

Light waves,water waves,rope waves

Question 9

Examples of longitudinal waves?

Answer 9

Sound waves and ultra sound waves

Question 10

Define pulse?

Answer 10

Single disturbance in a medium

Question 11

Define oscillation?

Answer 11

Any repeated to and fro motion of a fluid

Question 12

Examples of oscillations?

Answer 12

Turning fork and pendulum

Question 13

What is meant by wave motion?

Answer 13

An oscillation which transfers energy from one place to another without any net movement of the medium

Question 14

Wave motions is illustrated or shown by:

Answer 14

Springs , vibration in ropes

Question 15

Speed of sound (m/s) in air(gas)

Answer 15

330

Question 16

Speed of light (m/s) in air(gas)

Answer 16

300 000 000

Question 17

Speed of sound(m/s) in water?

Answer 17

1493

Question 18

Speed of light(m/s) in water?

Answer 18

225 000 000

Question 19

Speed of sound(m/s) in glass(solid)?

Answer 19

4549

Question 20

Speed of light(m/s) in glass(solid)?

Answer 20

200 000 000

Question 21

Speed of sound(m/s) in vacuum?

Answer 21

0

Question 22

Speed of light(m/s) in vacuum?

Answer 22

300 000 000

Question 23

Nb!! For speed of sound

Answer 23

The speed of sound increases as the density increases

Question 24

Nb!! For speed of light

Answer 24

The speed of light decrease as the density decreases

Question 25

What is a vacuum?

Answer 25

Space without matter

Question 26

Explain why sound travels faster in solids than in gases(using ideas about molecules)

Answer 26

Because the molecules are close together - it easily carry sound waves through

Question 27

Outline some of the practical consequences of the difference of the speed of sound and light in air( such as the observation that thunder always follows lighting)

Answer 27

*lighting strikes first before the sound of thunder is heard *lighting strikes and kill people *lighting can destroy vegetation *lighting can cause fires in houses,cars and buildings

Question 28

Define lighting?

Answer 28

Is an electrical discharge in the form of electrical current

Question 29

Define crest?

Answer 29

Highest point of a wave

Question 30

Define trought?

Answer 30

The lowest point of a wave