P5

Question 1

What is the wavelength and frequency of gamma rays

Answer 1

highest frequency

Shortest wavelength

Question 2

What is the wavelength and frequency of radio waves

Answer 2

Lowest frequency

longest wavelength

Question 3

Explain the uses of radio waves

Answer 3

Used to transmit radio and terrestrial tv signals because radio waves can travel a long way before being absorbed . This allows us to send radio waves all around earth

Question 4

Explain uses of microwaves

Answer 4

Used to heat up food because water molecules absorb microwaves causing food to heat up .
Also used to communicate with satellites in space because microwaves pass through the earths atmosphere without being reflected

Question 5

Explain uses of infrared

Answer 5

Used in infrared cameras

used to Cook food in ovens because objects easily absorb infrared

used in heaters because infrared is easily absorbed by the surface of objects

Question 6

Explain uses of Visible light

Answer 6

Used for communication using fibre optics - optical fibres are thin stands of glass and can carry a lot of information - used to carry telephone and cable Tv signals

Question 7

Explain uses of ultraviolet

Answer 7

Used in energy efficient lightbulbs - carries more energy than visible light

Also used in sun tanning - however increases the risk of skin cancer

Question 8

Explain uses of x rays

Answer 8

Used in medical scanning - x rays can be used to visualize broken bones . this is because x rays are very penetrative . also used in medical treatment

Question 9

Explain uses of gamma rays

Answer 9

Used to detect cancers and in medical treatment

this is because gamma rays are very penetrative

Question 10

Why do all EM waves travel at the same distance when emitted from sun

Answer 10

Because they all travel at the same speed in a vacuum