Electromagnetic Waves

Question 1

The higher the frequency the more __________ it carries

Answer 1

Energy

Question 2

Give the electromagnetic spectrum in order, longest wavelength and highest frequency first

Answer 2

Radio, microwave, infrared, light, ultraviolet, x-Ray’s, gamma

(So gamma carry the most energy)

Question 3

What does white, visible light contain

Answer 3

All the colours of the spectrum

Question 4

What is the use of microwaves

Answer 4

They transmit communication signals by passing waves with wavelengths that can travel through the atmosphere.

Question 5

What are radio waves used for

Answer 5

Transmit radio and tv signals

Question 6

What’s the Doppler effect?

Answer 6

When a source is moving, the frequency and wavelength change. If it’s moving towards the person the wavelength decreases and the frequency increases but if it’s moving away the wavelength increase and the frequency decreases.

Question 7

What does red shift tell us

Answer 7

Light has shifted to the red end of the spectrum

Can explain the Big Bang theory as it shows things are moving away and that we started from a small initial point but now it is moving away.

Large wavelength, small frequency

Question 8

What is CMBR

Answer 8

Cosmic microwave background radiation

Radiation created by the Big Bang as when it happened masses of gamma radiation was produced. The Big Bang is currently the only way to explain the existence of CMBR.

Question 9

Do electromagnetic waves travel at different speeds

Answer 9

No

They all travel at 300 million m/s