National 4 Physics Waves Revision

Question 1

Is a sound wave longitudinal or transverse?

Answer 1

Longitudinal

Question 2

Is a water wave longitudinal or transverse?

Answer 2

Transverse

Question 3

The definition of frequency is:

Answer 3

The number of waves per second.

Question 4

The unit of frequency is:

Answer 4

hertz (Hz)

Question 5

What is wavelength?

Answer 5

The distance from one wave to the next.

Question 6

What is amplitude?

Answer 6

The height of a wave from the middle to the top.

Question 7

The unit of sound level is:

Answer 7

decibel (dB)

Question 8

Why does an airport worker wear ear defenders?

Answer 8

To protect his hearing from loud sounds.

Question 9

What is the danger level for sound?

Answer 9

80-90 dB

Question 10

What is the risk of high sound levels?

Answer 10

They can damage hearing.

Question 11

Fluorescent chemicals are detectors of:

Answer 11

Ultraviolet radiation.

Question 12

Gamma rays can be detected with:

Answer 12

A Geiger-Muller tube

Question 13

An aerial can detect:

Answer 13

Radio waves and Microwaves

Question 14

How can Ultraviolet radiation harm humans?

Answer 14

Can cause skin cancer and damage eyesight.

Question 15

How can X-rays harm humans?

Answer 15

Can cause cancer.

Question 16

How can gamma rays harm humans?

Answer 16

Can cause cancer.

Question 17

The sun is a source of which three types of radiation?

Answer 17

Infrared, Visible light, Ultraviolet.

Question 18

A detector of infrared radiation is a:

Answer 18

Photodiode

Question 19

A detector of X-rays is:

Answer 19

Photographic film.

Question 20

A hot object is a source of:

Answer 20

Infrared radiation.

Question 21

Which type of radiation is used in thermal imaging cameras?

Answer 21

Infrared.

Question 22

Which type of radiation is used to detect security markings on bank notes?

Answer 22

Ultraviolet

Question 23

Which type of radiation is used to detect broken bones?

Answer 23

X-rays

Question 24

Describe an application (use) of Ultrasound.

Answer 24

To scan unborn babies.

Question 25

Are electromagnetic waves longitudinal or transverse:

Answer 25

Transverse.

Question 26

An example of noise pollution is:

Answer 26

Traffic noise; Aeroplanes overhead; Loud parties.

Question 27

Refraction is:

Answer 27

when light enters a different material and changes speed.

Question 28

The risk of skin cancer can be reduced by:

Answer 28

Using suncream.

Question 29

Which type of lens brings light rays together?

Answer 29

Convex.

Question 30

Which type of lens spreads light rays out?

Answer 30

Concave.