Corrections Flashcards
What happens if u drop two balls of the same size but different mass, in terms of terminal velocity
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.
What is the name given to any body that orbits planets
Satellites
When an appliance becomes love how does a circuit breaker work to make the appliance safe
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.
What happens to the current as resistance increases
As resistance increases current decreases because the voltage is staying the same. Using the equation voltage= current x resistance
What happens in a diode
Current flows only in one direction
What is meant by the amplitude of the wave
The height of the wave from the crest
Why can radio waves be received at long distances because..
They reflect off the ionsphere
Dangers of gamma rays
Cause mutations which can cause cancer
Can destroy cells
Why does light not spread out when light enters a rectangular block of glass
The sides of a rectangular block are parallel so all the light bends the same amount.
What is the range of frequencies heard by a human
20-20,000
When a car turns, what happens to it’s acceleration
It accelerates because there has been a change in direction and velocity
How is energy transferred through a solid block through conduction?
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.
how do power stations work
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.
How can the sun’s rays be used to heat water in the house?
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
What is the name for the method that some of the hydroelectricity power stations use to pump water back into the reservoir
Pumped storage
Pressure in a balloon
The number of collisions over the area of the walls of the balloon. The total of all the collisions.
How does a speaker work?
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.
What does it mean when it is said something is ionising?
Alpha particles for example are large and collide with other particles causing ionising.
Describe Rutherford’s model of the atom
A small positively charged nucleus where most of the mass is contained. The rest of the atom is mostly empty space.
What affects and doesn’t affect half life?
Size doesn’t affect half life but different isotopes do have different half lives.
Why is it difficult to dispose of radioactive waste?
If it has a long half life it can stay radioactive for a long time.
What is meant by an elastic object?
An object that can store elastic potential energy if they are stretched or squashed and will return to their original shape.
What is meant by alternating current?
Current that is constantly changing direction
Four causes of background radiation
Radon gas from the ground
Cosmic rays
Nuclear power
Living things-plants absorb radioactive material and it gets passed up the food chain
