Key Facts

Question 1

What colour is each wire in a plug ?

Answer 1

Blue - neutral
Brown- live
Yellow and green - earth

Question 2

Arrange the colours of visible light so they are ordered by frequency.

Answer 2

Red orange yellow green blue indigo violet (Richard of York gave battle in vain)

Question 3

Which scientist proposed that matter is made of tiny spheres called atoms that :
- cannot be broken up into smaller parts
-cannot be either created or destroyed

Answer 3

John dalton

Question 4

Which part of the earths structure causes its magnetic field and what two materials found there cause this

Answer 4

Earths core , iron and nickel

Question 5

Unit to measure radioactivity (radioactive decay )

Answer 5

Becquerels (Bq)
Measures the number of nuclear decays each second

Question 6

How’s a beta minus particle formed?

Answer 6

If a nucleus’s contains too many neutrons , a neutron may split into a proton and a fast moving electron , the electron is a beta minus particle.

Question 7

Density formula

Answer 7

Mass /volume =density

Question 8

Which type of wave can travel through a vacuum ?

Answer 8

Electromagnetic waves don’t need a medium and can travel through a vacuum.

Question 9

What you use displacement to measure ?

Answer 9

Volume

Question 10

Kinetic energy

Answer 10

Ke= 0.5xmassx(speed)squared

Question 11

When an appliance is running normally what voltage will be running through :
Earth wire
Live wire
Neutral wire

Answer 11

230v-live wire
0v-neutral and earth

Question 12

In this formula to find the acceleration of an object :
Vsquared-usquared =2ax

What does each variable represent ?

Answer 12

V= final velocity
U= initial velocity
A= acceleration
X= distance

Question 13

Which direction does the magnetic field travel ?

Answer 13

North Pole -> South Pole

Question 14

Specific heat capacity

Answer 14

The specific heat capacity of a substance is the amount of energy required to raise the temperature of 1kg of the substance by 1degrees C.

Question 15

Specific latent heat ?

Answer 15

Amount of energy needed for a substance to change state of 1kg of the substance with no change in temperature.

Question 16

When a substance changes state on a graph why does the temperature stop increasing and stay constant? (Graph levels off at these points)

Answer 16

Energy being put in is weakening or breaking the forces of attraction between particles (bonds)

Question 17

Specific latent heat of fusion

Answer 17

The energy required to change 1kg of a substance from a solid to a liquid with no change in temperature.

Question 18

Specific latent heat of vaporisation

Answer 18

The energy required to change 1kg of a substance from a liquid to a gas (vapour) with no change in temperature.

Question 19

E=M x l

Answer 19

Specific latent heat formula

Energy= mass x latent heat

Question 20

Answer 20

Specific heat capacity formula

Change in energy = mass x specific heat capacity x change in Temperature