Energy and work done
What is energy?
Energy is the ability to do work
How is sound formed?
Vibrations
What is a wave?
A moving disturbance in the energy level of a field.
How does light travel
Rays, waves or photons
What is the S.I unit of energy
Joules
What is amplitude?
The strength of a vibration
What are the properties of a wave?
Amplitude, frequency, wavelength
What is a group of light rays called?
A beam of light
What is the formula for work
W=Fd (work =force x distance)
What is the S.I unit of frequency?
Hertz (Hz)
State two electromagnetic waves
Radio waves, Microwaves, Infra-red radiation, Visible light, Ultraviolet radiation, X-rays, Gamma rays
What can happen to a light ray when it strikes an object?
It can be reflected, refracted, absorbed or diffracted
What is power?
Power is the rate of doing work
What type of wave is sound
Longitudinal
What are the two types of waves?
Transverse and longitudinal waves
What is a concave mirror
A concave mirror has a reflective surface that is curved inward and away from the light source.
What is the formula for kinetic energy and gravitational potential energy
KE =1/2 mass x velocity2
GPE =Mass x gravitational field strength x height
What is rarefaction?
Compression is a region in a longitudinal wave where the particles are closest together.
What electromagnetic wave has the shortest wavelength
Gamma rays
Is light a particle
Yes