Year 9 (Electromagnetic Scale)

Question 1

Order of Waves (Longest to Shortest)

Answer 1

• radio waves
• microwaves
• infrared
• visible light
• ultra violet
• rays
• gamma rays

Question 2

Uses of Radio Waves

Answer 2

Television signals

Question 3

Uses of microwaves

Answer 3

Cooking

Question 4

Uses of infrared

Answer 4

Fibre communication

Question 5

Uses of visible light

Answer 5

Seeing

Question 6

Uses of ultraviolet

Answer 6

Tanning beds

Question 7

Uses of x-rays

Answer 7

Images of bones

Question 8

Uses of gamma rays

Answer 8

Killing cancer cells

Question 9

Relative size of radio waves

Answer 9

Football pitch

Question 10

Relative size of micro waves

Answer 10

Butterfly

Question 11

Relative size of infrared

Answer 11

Bacteria

Question 12

Relative size of visible light

Answer 12

Virus

Question 13

Relative size of ultraviolet

Answer 13

Molecules

Question 14

Relative size of x-rays

Answer 14

Atoms

Question 15

Relative size of gamma rays

Answer 15

Atomic nucleas

Question 16

What are transverse waves

Answer 16

• vibrations perpendicular to the transferred energy

- oscillations and vibrations are at right angle to the travel

Question 17

What are longitudinal waves

Answer 17

• vibrations parallel to the energy being transferred

Question 18

Label a transverse wave

Answer 18

See book for answer

Question 19

Label a longitudinal wave

Answer 19

See book for answer

Question 20

What are mechanical waves

Answer 20

Waves which pass through a material are vibrations of that materials

Question 21

What are EM waves

Answer 21

Vibrating electricity or magnetic fields through space

Question 22

What are seismic waves

Answer 22

Waves which travel through the upper crust and tectonic movement (cause earthquakes)

Question 23

How to work out a ‘period’ (T)

Answer 23

1 / frequency

Question 24

How to workout ‘wave speed’ (m/s)

Answer 24

Frequency (Hz) x wavelength (M)

Question 25

Wave properties (Reflection) and draw

Answer 25

• waves will bounce off a surface under certain conditions as the surface must be shiny for electromagnetic waves

Question 26

Wave properties (refraction) and draw

Answer 26

• when waves cross a medium or less or more dense surfaces causing a change in speed and wavelength (slows in denser material)

Question 27

Wave properties (diffraction) and draw

Answer 27

• when waves pass through a gap that is roughly the same size or smaller than the wavelength
• larger gap (curves at the edges of the wave)
• small gap (waves fan out in the circle)