Waves

Question 1

What can we use Infrared for?

Answer 1

Remotes, thermal imaging, cooking

Question 2

What can we use Radio waves for?

Answer 2

Television, Radio, Satellite transmission

Question 3

What can we use Visible light for?

Answer 3

Seeing, Photos

Question 4

What can we use Microwaves for?

Answer 4

Cooking, communication

Question 5

What is the difference between L waves and T waves

Answer 5

With Transverse waves they vibrate perpendicular to the direction of travel, however with longitudinal waves, they vibrate parallel to the direction of travel.

Question 6

How to transverse ways move

Answer 6

Oscillate perpendicular to direction of travel

Question 7

What is frequency

Answer 7

Number of waves passing a certain point per second

Question 8

What is wave length

Answer 8

distance covered by a full cycle of the wave, usually measured from peak to peak, or trough to trough

Question 9

What are P waves

Answer 9

They are longitudinal waves that travel quickly through solids and liquids

Question 10

What are S waves

Answer 10

They are transverse waves that can travel slowly through solids

Question 11

What is reflection

Answer 11

When a wave hits boundary between two media where the wave speeds differ, but the wave stays in the original medium instead of passing into the second medium.

Question 12

What is refraction

Answer 12

when a wave changes direction as it crosses a boundary.

Question 13

Why does refraction occur

Answer 13

due to a change in the speed of the light ray or wave.

Question 14

What is wave speed

Answer 14

the distance travelled by a wave per unit time, usually measured in metres per second (m/s)

Question 15

What happens when the angle of incidence is less than the critical angle

Answer 15

Refraction

Question 16

What happens when the angle of incidence is more than the critical angle

Answer 16

Reflection

Question 17

What happens when the angle of incidence is equal than the critical angle

Answer 17

The line goes across the straight part of the semi circle

Question 18

Why don’t we use radio waves for satellite transmissions

Answer 18

When radio stations use similar transmission frequencies the waves sometimes interfere with each other. Medium wavelength radio waves are reflected from the ionosphere so they can be used for long distance communication, but not for communicating with satellites above the ionosphere.

Question 19

Uses for Ultrasound

Answer 19

Foetal scanning, cleaning jewlery, dog whisltle

Question 20

Uses for infra sound

Answer 20

Detect meteors, elephant/whale communication, studying the earths strcuture

Question 21

Where/How are gamma rays formed

Answer 21

Radio active decay

Question 22

Where/How are VL UV and Xrays made

Answer 22

When electrons drop down energy levels

Question 23

How are radio waves produced

Answer 23

Radio waves can be produced by oscillations in electrical circuits.

Question 24

Do radio wave a long wave length

Answer 24

Yes, But a small frequency

Question 25

Does Gamma rays have a long wave length

Answer 25

No, they have a small wave length and a large frequency

Question 26

Why does light split up into different coulours

Answer 26

Different coulours have different wave lengths which means they travel at different speeds so they will refract by different amounts