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Harris Academy N4 Physics > Waves > Flashcards

Flashcards in Waves Deck (64)
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1

What is meant by the amplitude of a wave?

It is the distance from the centre of the wave to the crest or trough.

2

What is meant by the frequency of a wave?

The number of waves per second.

3

What is meant by the wavelength of a wave?

It is the distance from a point on one wave to the same point on the next.

4

Describe how to measure the speed of sound with two students using a clapper board, stop watch and trundle wheel.

  • One student takes the clapperboard and stands still.
  • The other students takes the stop watch and uses the trundle wheel to measure a set distance away.
  • The first student shuts the clapper board.
  • The other student starts the stop watch when they see the clapper shut and stops it when they hear the sound.
  • Speed of sound is calculated by distance between the students divided by the time on stop watch.

5

Describe how to measure the speed of sound using the equipment below.

  • Make a loud sound to the left of the first microphone.
  • When the sound reaches microphone one it starts the fast timer, when the sound reaches the second microphone this stops the timer.
  • Measure the distance between the microphones using a metre stick.
  • The speed is calculated from distance between the microphones divided by the time on fast timer.

6

You are 5km away from a thunder storm. What reaches you first - the thunder or the lighning? Explain your answer.

The lightning. The speed of light is faster than the speed of sound.

7

You are 10km from a thunder storm. You count 15 seconds between seeing the lightning and hearing the thunder. How do you calculate how far away the storm is?

Use d = vt

Where v is the speed of sound.

t is 15 seconds.

8

You are 10km from a thunder storm. You count 15 seconds between seeing the lightning and hearing the thunder. You repeat this after the next lightning strike, the time between the lightning and the thunder is now 10 seconds. What does this tell you?

The storm has moved closer to you.

9

What is meant by a longitudinal wave?

A wave that vibrates along the direction of travel.In a longitudinal wave, the motion of the medium is parallel to the direction of the wave.

10

What is meant by a transverse wave?

A wave that vibrates at ninety degrees to the direction of travel. A transverse wave is a wave in which the motion of the medium is at right angles to the direction of the wave.

11

What type of wave is a sound wave?

Longitudinal.

12

What type of wave is a water wave?

Transverse.

13

What type of wave is a microwave?

Transverse.

14

Name a longitudinal wave.

Sound.

15

Name 3 transverse waves.

  • Radio
  • Microwave
  • Infrared
  • Visible light 
  • Ultraviolet
  • X-rays
  • Gamma rays
  • Water waves

16

Name the members of the electromagnetic spectrum, from lowest to highest frequency.

(Ronald Mcdonald Is Very Ugly eXclaimed George)

  • Radio
  • Microwave
  • Infrared
  • Visible Light
  • Ultraviolet
  • X-rays
  • Gamma radiation

17

Which member of the electromagnetic spectrum has the most energy?

Gamma radiation as it has the highest frequency

18

State one detector of radio waves.

Aerial

19

State one detector of microwaves.

Aerial

20

State one detector of infrared

  • photodiode
  • phototransistor

21

State one detector of visible light.

  • Eye,
  • photographic film

22

State one detector of Ultraviolet light.

  • Some chemicals glow or fluoresce under it
  • photocells

23

State one detector of X-rays

Photographic film

24

State one detector of gamma radiation

  • Photographic film
  • GM Tube
  • Bubble chamber

25

State one source of radio waves.

  • Transmitter
  • Stars

26

State one source of microwaves.

  • Transmitter
  • Magnetron

27

State one source of infrared.

  • Stars
  • Lamps
  • Flames

28

State one source of visible light.

  • The Sun
  • Light bulbs
  • Anything hot enough to glow

29

State one source of ultraviolet light.

  • Sun
  • Special Lamps

30

State one source of X-rays.

  • Stars
  • Nebula