⭐️Topic SP4 - Waves Flashcards Preview

Physics Gcse > ⭐️Topic SP4 - Waves > Flashcards

Flashcards in ⭐️Topic SP4 - Waves Deck (46)
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1

What are transverse waves?

Waves where the particles move up and down at right angle to wave direction

2

Give some examples of transverse waves

Water waves, S waves and em waves

3

What are longitudinal waves?

Where particles in the material move parallel to the direction of wave travel

4

Give examples of longitudinal waves

Sound waves, p waves

5

What’s a difference between transverse and longitudinal waves?

Transverse waves don’t need a medium to travel through but longitudinal waves do

6

What is the wave frequency and it’s unit?

The number of waves passing a point each second in Hz

7

What does frequency determine for sound and light?

In sound, it determines the pitch and light it determines the colour

8

What is the period?

The length of time taken for wave to pass a given point

9

What is wavelength and give it’s unit?

The distance from one point of a wave to the same position on the next point of the wave in meters

10

What is amplitude and give the unit?

The maximum distance of a point on the wave away from its rest position. (Greater the amplitude, the louder the sound) Measured in meters

11

What is velocity of a wave?

The speed of a wave in the direction its travelling.

12

How do you calculate wave speed using distance and time?

Speed (m/s) = distance (m) / time (s)

13

How do you calculate wave speed in terms of frequency and wavelength?

Wave speed (m/s) = frequency (Hz) x wavelength (m)

14

Where does refraction of a light ray occur?

At the interface between the two mediums

15

When light from air to glass or water,

It refracts towards the normal

16

When light goes from a more dense medium to a less dense one,

It refracts away from the normal

17

Why does light refract when going from one media to another?

Because of the change in speed

18

What does it mean if light bends towards the normal?

It’s slowing down

19

How does the speed of light change when entering a less dense object

It speeds up and so refracts away from the normal

20

When does light not refract upon entering a different medium?

When it’s travelling along the normal

21

What does it mean when light is
A) reflected
B)refracted
C) absorbed
B) transmitted

A) the wave bounces off
B) the wave passes into the new material but changes the direction its travelling
C) the wave passes through the material and isn’t absorbed/reflected
D) the wave’s energy is transferred to the material

22

Why can a prism split up visible light?

Because each colour changes speed by different amounts when they go from a more dense medium to a less dense one (or vice versa)

23

What is an echo?

When a sound wave is reflected by a hard surface

24

What is the human range of hearing?

20 -20 000 Hz

25

What’s ultrasound?

Any sound above 20,000Hz

26

How does a sound wave affect a solid?

It changes the pressure in the surface causing the particles to vibrate

27

What kind of waves can vibrations in a solid be passed on as?

Both transverse and longitudinal waves

28

What determines how vibrations of different frequencies affect a solid?

The shape and properties if a solid

29

What are the steps to how sound waves travel through the ear?

1. Waves enter ear canal
2. Sound waves cause the ear drum to vibrate
3. Vibrations get passed into tiny bones
4. Vibrations pass onto the liquid of the
cochlea
5. Tiny hairs in the cochlea detect
vibrations forming impulses
6. Impulses travel along the auditory neurone to reach the brain

30

What do the small bones in your ear do to the vibrations that came from the ear drum?

They amplify them