Corrections

Question 1

What happens if u drop two balls of the same size but different mass, in terms of terminal velocity

Answer 1

The ball with the lower weight will have the lower terminal velocity. They both have the same force of air resistance but this air resistance balances the lower ball’s weight at a lower velocity. Therefore it’s terminal velocity is lower.

Question 2

What is the name given to any body that orbits planets

Answer 2

Satellites

Question 3

When an appliance becomes love how does a circuit breaker work to make the appliance safe

Answer 3

There is energy flowing through the casing and the earth wire, This trips the circuit breaker which breaks the circuit. This stops the current flowing so makes the appliance safe again.

Question 4

What happens to the current as resistance increases

Answer 4

As resistance increases current decreases because the voltage is staying the same. Using the equation voltage= current x resistance

Question 5

What happens in a diode

Answer 5

Current flows only in one direction

Question 6

What is meant by the amplitude of the wave

Answer 6

The height of the wave from the crest

Question 7

Why can radio waves be received at long distances because..

Answer 7

They reflect off the ionsphere

Question 8

Dangers of gamma rays

Answer 8

Cause mutations which can cause cancer

Can destroy cells

Question 9

Why does light not spread out when light enters a rectangular block of glass

Answer 9

The sides of a rectangular block are parallel so all the light bends the same amount.

Question 10

What is the range of frequencies heard by a human

Answer 10

20-20,000

Question 11

When a car turns, what happens to it’s acceleration

Answer 11

It accelerates because there has been a change in direction and velocity

Question 12

How is energy transferred through a solid block through conduction?

Answer 12

As the particles in the solid are heated, they gain kinetic energy. They collide with their neighbouring particles and transfer some of their heat energy over.

Question 13

how do power stations work

Answer 13

They burn the fuel which creates heat energy. This heats the water which turns into steam. This rises and turns the turbine, this turns the generator which creates electrical energy.

Question 14

How can the sun’s rays be used to heat water in the house?

Answer 14

Electrical energy can be used used to heat water. Solar hot water panels absorb energy from the sun to heat water inside of them, this hot water can then be supplied to the home

Question 15

What is the name for the method that some of the hydroelectricity power stations use to pump water back into the reservoir

Answer 15

Pumped storage

Question 16

Pressure in a balloon

Answer 16

The number of collisions over the area of the walls of the balloon. The total of all the collisions.

Question 17

How does a speaker work?

Answer 17

When AC current flows through the coil of wire in a magnetic field. The coil experiences a force. This force causes the the coil and the cone to move. Because it’s AC current the direction of the force is constantly changing, causing the cone to vibrate and send these vibrations along air particles.

Question 18

What does it mean when it is said something is ionising?

Answer 18

Alpha particles for example are large and collide with other particles causing ionising.

Question 19

Describe Rutherford’s model of the atom

Answer 19

A small positively charged nucleus where most of the mass is contained. The rest of the atom is mostly empty space.

Question 20

What affects and doesn’t affect half life?

Answer 20

Size doesn’t affect half life but different isotopes do have different half lives.

Question 21

Why is it difficult to dispose of radioactive waste?

Answer 21

If it has a long half life it can stay radioactive for a long time.

Question 22

What is meant by an elastic object?

Answer 22

An object that can store elastic potential energy if they are stretched or squashed and will return to their original shape.

Question 23

What is meant by alternating current?

Answer 23

Current that is constantly changing direction

Question 24

Four causes of background radiation

Answer 24

Radon gas from the ground
Cosmic rays
Nuclear power
Living things-plants absorb radioactive material and it gets passed up the food chain

Question 25

What theory does brownish motion provide evidence for?

Answer 25

Particle theory

Question 26

Uses of microwaves

Answer 26

To heat up food

For electrical transmissions in mobile phones

Question 27

Uses of radio waves

Answer 27

Radar
Communication transmissions
Satelites
Computer networks