P1.5 Different waves

Question 1

In a transverse wave how does the energy travel?

Answer 1

Perpendicular

Question 2

In a longitudinal wave how does the energy travel?

Answer 2

Parallel

Question 3

What is the electromagnet spectrum starting with lowest energy and frequency and longest wavelength at the top

Answer 3

• Radio waves
• Microwaves
• Infrared
• Visible light
• Ultraviolet
• X-rays
• Gamma radiation

Question 4

Give an example of each waves

Answer 4

Radio waves = television signals 
Microwaves = cooking mobile phones 
Infrared = optical fibre communication 
Visible light = seeing 
Ultraviolet = detecting forged bank notes 
X-rays = medical images of bones 
Gamma radiation = killing cancer cells

Question 5

Give an example of transverse waves

Answer 5

Electromagnet radiation

Question 6

Give an example of longitudinal waves

Answer 6

Sound waves

Question 7

Longitudinal waves show areas of what?

Answer 7

Compression (close together)

Rarefaction (further apart)

Question 8

What is diffraction?

Answer 8

The effect of waves spreading out when passing through a gap or passing by a barrier where the waves would go around the corners

Question 9

What happens during refraction when the ray enters medium that is more dense?

Answer 9

The ray bends towards the normal

Question 10

What happens during refraction when the ray enters a medium that is less dense?

Answer 10

The ray bends away from the normal

Question 11

Define frequency, wavelength and amplitude

Answer 11

Frequency = number of complete cycles per second

wavelength = distance of one complete cycle

amplitude = distance from top of crest to bottom of trough

Question 12

What is the equation for finding out speed in metres per second?

Answer 12

v = f x λ

Question 13

What does v, f and λ mean?

Answer 13

v = speed in metres per second 
f = frequency in hertz per second 
λ = wavelength in metres

Question 14

What is the angle of incidence equal to?

Answer 14

The angle of reflection

Question 15

What is the normal line?

Answer 15

The line that is perpendicular (90 degrees) to the medium

Question 16

When an object moves away from an observer what is its light affected by?

Answer 16

The Doppler effect

Question 17

How do we know our sun contains helium?

Answer 17

Because there are black lines in the light spectrum where helium has absorbed light

Question 18

What is the light spectrum starting with smallest wavelength and biggest frequency

Answer 18

Purple 
Blue 
Green 
Yellow 
Orange 
Red

Question 19

What colour do stars appear the further they are from us and why?

Answer 19

Red
because we only see the largest wavelengths which is red as the smaller wavelengths are in front of the star being pushed together which would be purple

Question 20

What does red shift tell us about distant galaxies?

Answer 20

Thy are moving away from us and the further away the galaxy is the faster it moves