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AQA GCSE Physics > P6 Waves > Flashcards

Flashcards in P6 Waves Deck (48)
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1

What are the two types of waves?

Transverse and longitudinal are the two different types of wave.

2

How would you define a transverse wave?

The movement of the particles is at right angles to the direction of the wave.

3

How would you define a longitudinal wave?

The movement of the particles is parallel to the direction of the wave.

4

Name a transverse wave.

Light, water, mexican, all the waves on the electromagnetic spectrum, are all transverse waves. 

5

Name a longitudinal wave

Sound is good example of a longitudinal wave.

6

On a longitudinal wave, what is meant by an area of compression, and an area of rarefaction?

An area of compression is where the particles are closest together, and rarefaction is where the particles are furthest apart.

7

What is meant by the amplitude of a wave?

The amplitude of a wave is the maximum displacement of the wave away from its undisturbed position. (From the middle to the top or the middle to the bottom, NOT top to bottom!)

8

What is meant by the wavelength of a wave?

The wavelength of a wave is the distance from a point on one wave to the same point on the next wave.

It could be peak to peak, or trough to trough.

9

What is frequency?

Frequency is the number of waves per second.

10

What is frequency measured in?

Frequency is measured in Hertz (Hz).e.g. 10 Hz means 10 waves per second.

11

What is meant by the period of a wave?

The period of a wave is the time (number of seconds) it takes for each wave to go by.

12

What is the relationship between frequency and period?

period = 1/frequency

frequency = 1/period

13

What is the wave equation?

(The equation that relates the speed of a wave to its frequency and wavelength)

speed = frequency x wavelength

14

What is the law of reflection?

TRIPLE ONLY

The angle of incidence = angle of reflection

15

What is refraction?

TRIPLE ONLY

As light moves from a less dense medium to a more dense medium the light bends towards the normal. This change of direction is called refraction.

16

Why does refraction occur?

TRIPLE ONLY

Refraction happens beacause the waves change speed as they enter a different medium. They slow down if they enter something more dense and speed up if they enter something less dense.

17

How do sound waves travel through solids?

TRIPLE ONLY

Sound waves travel through solids by passing vibrations through the solid.

18

What is the frequency range of human hearing?

TRIPLE ONLY

The frequency range of human hearing is from 20 - 20,000 Hertz

19

What is ultrasound?

TRIPLE ONLY

Sound waves with a frequency greater than 20000Hz which humans cant hear.

20

Explain how ultrasound can be used to produce a picture of an unborn baby.

TRIPLE ONLY

Ultrasound reflects from boundaries between different tissues. The computer uses the time taken for these reflections.

21

Why is ultrasound used instead of xrays in baby scans?

TRIPLE ONLY

Ultrasound is used instead of xrays in baby scans becuase x-rays can damage living cells and so could damage the fetus.

Also, x-rays go straight through soft tissues, so would only show the bones.

22

What are the two types of earthquake (seismic) waves?

TRIPLE ONLY

The two types of earthquake (seismic) waves are P and S waves.

23

What are the key features of P waves?

TRIPLE ONLY

The key features of P waves are:

Primary waves

Faster than S waves

Longitudinal

Can go through solids and liquids

24

What are the key features of P waves?

TRIPLE ONLY

The key features of S waves are:

Secondary waves

Slower than P waves

Transverse

Can go through solids only

25

How do scientsist use earthquake waves to work out what the inside of the Earth is like?

TRIPLE ONLY

S waves don't travel through liquid, and leave a shadow zone which shows that the outer core must be made of liquid. Refraction also shows how the density inside the Earth changes.

26

What's a seismometer?

TRIPLE ONLY

A seismometer is a device for measuring seismic waves.

27

What's a seismograph

TRIPLE ONLY

A seismograph is the picture of vibrations caused by earthquake waves.

28

What is the electromagnetic spectrum?

A family of waves: radio waves, microwaves, infrared waves, visible waves, ultraviolet waves, x rays and gamma rays.

29

Can you recall the e/m spectrum in order of decreasing frequency?

A family of waves: radio waves, microwaves, infrared waves, visible waves, ultraviolet waves, x rays and gamma rays.

30

Give some uses for radio waves.

Radio waves – television and radio