Elecromagnetic Spectrum

Question 0

This colour light will slow down more than red light when it passes from a transparent material to air.

Answer 0

Violet

Question 1

The colours of the _____ _____ are red, orange, yellow, green, blue, indigo and violet.

Answer 1

Visible spectrum

Question 2

This colour will absorb all colours of the spectrum and reflect no light.

Answer 2

Black

Question 3

For white light to be reflected, _____ the colours of the spectrum have to be reflected.

Answer 3

All

Question 4

An object of this colour would absorb all of these colours; red, orange yellow, green, blue and indigo.

Answer 4

Violet

Question 5

Bananas only reflect light of this colour.

Answer 5

Yellow

Question 6

The name given to the process of splitting white light into a spectrum when refraction occurs.

Answer 6

Dispersion

Question 7

Using only water particles in the air to disperse light, one of these can be formed.

Answer 7

A rainbow

Question 8

Light will slow down as it passes from any transparent material to this substance.

Answer 8

Air

Question 9

List the parts of the electromagnetic spectrum.

Answer 9

Radio-waves (lowest energy and frequency, highest wavelength)
Microwaves
Infrared
Visible light (ROYGBIV)
Ultraviolet
X-ray
Gamma-rays (highest energy and frequency, shortest wavelength)

Question 10

What is the electromagnetic spectrum?

Answer 10

A vast band of energy frequencies extending from radio-waves to gamma-rays.

Question 11

Which property of the waves indicates how much energy it has?

Answer 11

Frequency

Question 12

X-rays, visible light and gamma rays are all examples of this.

Answer 12

Radiation

Question 13

All the different types of radiation have their own specific _____.

Answer 13

Frequencies

Question 14

The approximate wavelength of red light.

Answer 14

700 nano metres

Question 15

Most of the light we can see comes from this place.

Answer 15

Sun

Question 16

The approximate wavelength of a microwave.

Answer 16

10 to the power of -1 metres

Question 17

The approximate wavelength of a gamma ray.

Answer 17

10 to the power of -12 metres

Question 18

The hight of a wave is given this name.

Answer 18

Amplitude

Question 19

Ultraviolet energy has enough energy to cause this.

Answer 19

Sunburn

Question 20

As the frequency of light increases, the wavelength _____.

Answer 20

Decreases

Question 21

Of all the forms of radiation, which would give you the worst burn?

Answer 21

Ultraviolet

Question 22

What would be the frequency of waves hitting the beach.

Answer 22

0.1 hertz

Question 23

How did early thinkers see light energy as moving?

Answer 23

In straight lines (as rays)

Question 24

When rays of light hit smooth, shiny surfaces, what do they do?

Answer 24

Reflect

Question 25

Many rays moving together form a _____.

Answer 25

Light beam

Question 26

State the Law of Reflection

Answer 26

A light ray will reflect at the same angle (to the normal) as the incoming light ray (incident ray)

Question 27

What is the angle of incidence?

Answer 27

The angle between the incoming light ray and the normal.

Question 28

What is the angle of reflection?

Answer 28

The angle between the outgoing light ray and the normal

Question 29

What is meant by a plane mirror.

Answer 29

A straight mirror.

Question 30

Use for radio waves?

Answer 30

Communication

Question 31

Use of microwaves.

Answer 31

Cooking, communication and radar.

Question 32

Use of infrared waves

Answer 32

Heat, TV control, security alarms.

Question 33

Use of visible light rays.

Answer 33

To see things.

Question 34

Use of ultra violet waves

Answer 34

Detecting forged bank notes, hardening of some types of dental filling, to kill microbes and sterilise surgical equipment.

Question 35

Use of x rays

Answer 35

To detect fractures in bones, to detect foreign objects in the body

Question 36

What is the use of gamma rays.

Answer 36

To kill cancer cells, to inspect castings and welds.