Laws

Question 1

Hookes Law

Answer 1

Force is directionally proportional to the extension until it reaches the limit of proportionality

Question 2

Add heat to a thermistor what does it due to resistance

Answer 2

Decreases

Question 3

Add light to an LDR what does it do to the resistance

Answer 3

Decreases

Question 4

Double insulation?

Answer 4

Plastic casings or the Earth wire does not touch the metal casing

Question 5

Pros of a circuit breaker vs fuse

Answer 5

Faster and can be reset

Question 6

Use of LED

Answer 6

Check for electricity in a circuit or appliance

Question 7

Lowest frequency on EM spectrum

Answer 7

Radio waves

Question 8

Harms of EM spectrum

Answer 8

Microwaves- Internal heating of tissues
Infa red- Skin burns
Ultra violet- blindness
Gamma rays- Ionisation and cancer

Question 9

Angle of incidence vs reflection

Answer 9

Equal

Question 10

Parts of longitudinal waves

Answer 10

Compressions, rarefactions, parallel to direction

Question 11

Parts of transverse waves

Answer 11

Peaks, troughs, vibrations at right angles to the direction

Question 12

When does TIR occur

Answer 12

When the angle of incidence is greater than the critical angle

Question 13

Voltage shared in series?

Answer 13

Yes

Question 14

Ampage shared in parallel?

Answer 14

Yes

Question 15

How does light reflect in a triangular prism?

Answer 15

Right angles at 90 degrees, dispersion at other angles

Question 16

What corner are bigger stars in in HR diagrams

Answer 16

Top right

Question 17

What corner are smaller stars in HR diagrams

Answer 17

Bottom left

Question 18

Where are pain sequence stars in Hr diagrams

Answer 18

Too left to bottom right

Question 19

Doppler effect?

Answer 19

When waves move away the wavelength increases (shift towards the red part of the spectrum)

Question 20

Use of moderator in fission?

Answer 20

Slows down neutrons so they are more easily absorbed

Question 21

Use of control rods?

Answer 21

Prevent the chain reaction form growing so exponentially

Question 22

Fusion definition?

Answer 22

2 smaller nuclei fuse together to make a large nucleus with slightly smaller mass

Question 23

What does magnetically hard mean

Answer 23

Permenatly magnetised