P1.5

Question 1

What is an oscillation?

Answer 1

A vibration

Question 2

What are longitudinal waves for?

Answer 2

Sound

Question 3

What is the makeup of longitudinal waves? How do they move?

Answer 3

The vibration goes in the same direction as energy, In a straight line with compressions and rare-fractions.

Question 4

What are transverse waves for?

Answer 4

Light (all electromagnets)

Question 5

What is the makeup of transverse waves? How do they move?

Answer 5

The vibrations goes perpendicular to the direction of the energy in peaks and troughs.

Question 6

What is the wave equation?

Answer 6

Wave Speed(m/s)= Frequency(Hz) x Wave length(m)

Question 7

What is the speed of light?

Answer 7

3 x 10(8) = 300,000,000

Question 8

What is the electromagnetic spectrum?

Answer 8

Radiowaves, Microwaves, Infrared radiation, Visible light, Ultraviolet, X rays, Gamma rays

Question 9

What are the colours in visible light?

Answer 9

Red, Orange, Yellow, Green, Blue, Indigo, Violet

Question 10

Which 3 in the electromagnetic spectrum can damage DNA in cells?

Answer 10

Ultraviolet, x rays and gamma rays

Question 11

At what speed do all of the electromagnetic spectrum travel at?

Answer 11

At speed of light = 3 x 10(8)

Question 12

What is the use of radiowaves?

Answer 12

TV Signals

Question 13

What is the use of microwaves?

Answer 13

Heating food, phone communication

Question 14

What is the use of Infrared radiation?

Answer 14

Remote controls

Question 15

What is the use of Ultraviolet?

Answer 15

Sun tan, detect forgery

Question 16

What is the use of x rays?

Answer 16

Broken bones, hidden bombs

Question 17

What is the use of gamma rays?

Answer 17

Kill cancerous cells

Question 18

What is the law of reflection?

Answer 18

Angle of incidence = angle of reflection

Question 19

What happens when light travels from a space of low density to a space of high density?

Answer 19

The angle of reflection moves towards the normal

Question 20

Expain diffraction

Answer 20

Diffraction occurs when a wave passes an edge or passes through a narrow gap or goes past an object.
None of the properties of a wave are changed by diffraction, but the direction of the wave is changed to go between the gap or obstacle.

Question 21

Explain refraction

Answer 21

Refraction occurs when a wave moves from one material to another, as the light speeds up and passes through the different materials, the angle of refraction is bigger than the angle of incidence.

Question 22

If the frequency of a sound is high, then what is the pitch?

Answer 22

High

Question 23

If the frequency of a sound is low, then what is the pitch?

Answer 23

Low

Question 24

What is the doppler effect?

Answer 24

The apparent change in the frequency of a wave caused by the relative motion of the source and the observer. (when a sound coming towards you sounds louder than it actually is)

Question 25

Where is the doppler effect used?

Answer 25

There are doppler scans in medicine to measure how fast an unborn baby’s blood flows, and in speed cameras.

Question 26

What is redshift?

Answer 26

Where an object coming towards you looks more red and an object moving away from you looks more blue than it really is.

Question 27

What did Sir Fred Hoyle believe about creation?

Answer 27

STEADY SLATE: He believes that the universe had no start and would always be the same

Question 28

What does Steven Hawking believe about creation?

Answer 28

THE BIG BANG THEORY: He believes that the universe had a definite beginning from a small point, and is constantly expanding.

Question 29

What is CMBR?

Answer 29

Cosmic Microwave Background Radiation - When the Big Bang happened, there were loads of infrared radiation which stretched to turn into microwaves.

Question 30

Give some possible evidence to support the Big Bang Theory

Answer 30

Red shift could support it as stars in our atmosphere appear red tinted which means that they are moving away from us so they must have started close together.