Waves and Radiation

Question 1

What do waves carry?

Answer 1

Energy

Question 2

What are the two main types of waves?

Answer 2

Longitudinal and transverse waves

Question 3

What is another name for longitudinal waves?

Answer 3

Compression waves

Question 4

How do the particles in longitudinal (compression) waves move?

Answer 4

Backward and forward in the same as the wave, e.g. sound (refer to diagram)

Question 5

How do the particles in transverse waves move?

Answer 5

At right angles to the direction of the wave, e.g. electromagnetic radiation such as light and water waves. (refer to diagram)

Question 6

What type of waves are water waves?

Answer 6

Transverse waves

Question 7

What type of objects create sound?

Answer 7

Vibrating objects.

Question 8

Quicker vibrations produce…?

Answer 8

Higher pitch sounds

Question 9

Bigger vibrations produce…?

Answer 9

Louder sounds

Question 10

What does sound need present in order to be transmitted?

Answer 10

Molecules

Question 11

Do sounds travel quicker through solids or gases?

Answer 11

Solids

Question 12

What is reflected sound called?

Answer 12

Echo

Question 13

What type of sound is music?

Answer 13

Sound that has a regular pattern, sounds are pleasant and peaceful

Question 14

What type of sounds is noise?

Answer 14

Sound that has no pattern, it is not pleasant to listen to

Question 15

What is a ultrasound?

Answer 15

High pitch sound waves used to study internal body structures.

Question 16

What is the speed of sounds in air?

Answer 16

340m/ sec or 1220km/ hr

Question 17

How does electromagnetic radiation travel?

Answer 17

By transverse waves.

Question 18

Order these from short wavelength/ high frequency to long wavelength/ low frequency:
U.V, Infra- red, microwaves, light, radiowaves, X- rays, gamma rays

Answer 18

Gamma rays
X- rays
U.V
Light
Infra- red
Microwaves
Radiowaves

Question 19

What are mirrors?

Answer 19

Reflected light

Question 20

Flat mirror

Answer 20

Refer to diagram

Question 21

Concave mirror

Answer 21

Refer to diagram

Question 22

What do lenses do to light that passes through them?

Answer 22

They refract light.

Question 23

What do concave lens do to light rays?

Answer 23

Bend them apart (refer to diagram)

Question 24

What do convex lens do to light rays?

Answer 24

Refracts light rays to a point. The more curved the lens, the greater the refraction. (refer to diagram)

Question 25

Name some objects that contain convex lens.

Answer 25

Optical instruments such as cameras, telescope, overhead projector and microscopes.

Question 26

White light consists of the colours of the spectrum..... together

Answer 26

blended

Question 27

What are the primary colours?

Answer 27

Red, green and blue

Question 28

A red object reflects ... light and .... other colours

Answer 28

red, absorbs

Question 29

What colours do white reflect and absorb?

Answer 29

Reflects all colours and abosrbs none

Question 30

What colours do black reflect and absorb?

Answer 30

Reflects none, absorbs all colours

Question 31

What cells in the retina of the eye detects colours?

Answer 31

Cone (nerve) cells

Question 32

What is refraction?

Answer 32

Bending of light

Question 33

Why does light refract?

Answer 33

It travels at different speeds in different density materials.

Question 34

What are X- rays used for?

Answer 34

To detect broken bones

Question 35

What is frequency?

Answer 35

The number of waves that passes a given point per second.