P6: Waves

Question 1

What is the wavelength?

Answer 1

peak to peak or trough to trough

Question 2

What is the amplitude?

Answer 2

Middle to peak/trough

Question 3

What is the direction of movement/oscillation for a transverse wave?

Answer 3

Up and down

Question 4

What is the direction of energy transfer for a wave?

Answer 4

Sideways

Question 5

What are the different areas of a longitudinal wave called?

Answer 5

• Area of compression
• Area of rarefaction

Question 6

What is the direction of energy for a longitudinal wave?

Answer 6

Sideways

Question 7

What is frequency?

Answer 7

The number of waves that pass a point per second

Question 8

What is the frequency of a short wavelength wave?

Answer 8

High

Question 9

What is the frequency of a long wavelength wave?

Answer 9

Low

Question 10

How do we measure time period(s)?

Answer 10

1/frequency(Hz)

Question 11

What apparatus do we use to measure speed of a wave?

Answer 11

• A ripple tank
• Thing goes in and out producing waves
• Measure wavelength using photo
• Work out frequency
• FREQUENCY X WAVELENGTH

Question 12

What equation do we use to work out the speed of a wave(m/s)?

Answer 12

Frequency(Hz) x wavelength(m)

Question 13

What is the angle of reflection equal to?

Answer 13

The angle of incidence i=r

Question 14

What is the normal line?

Answer 14

A dashed line drawn at 90 degrees to the mirror

Question 15

What is produced when a sound wave is reflected?

Answer 15

An echo

Question 16

What type of wave is a sound wave?

Answer 16

A longitudinal wave

Question 17

What does a sound wave do?

Answer 17

Vibrate the air particles
Eardrum picks up vibration of air particles and turns into sound that your brain can interpret

Question 18

What is the range of human hearing?

Answer 18

20Hz-20kHz

Question 19

What can echo/ultrasound be used to do?

Answer 19

Determine distance
Speed = distance / time
Speed is known, measure time taken and calculate distance
There and back, so time is DOUBLE what it would be

Question 20

What are P waves?

Answer 20

• Primary waves
• Longitudinal
• Travel through solids and liquids

Question 21

What are S waves?

Answer 21

• Secondary waves
• Transverse
• Only go through solids

Question 22

What is the order of the electromagnetic spectrum from largest wavelength to shortest wavelength?

Answer 22

• Radiowaves
• Microwaves
• Infrared
• Visible light
• Ultraviolet
• X-Ray
• Gamma Rays

Question 23

What happens to the energy as the wavelength gets shorter?

Answer 23

Higher energy

Question 24

What can radiowaves be used for?

Answer 24

Radio communications

Question 25

What can microwaves be used for?

Answer 25

- Mobile phones - Heating food

Question 26

What can infrared be used for?

Answer 26

- Light on remote control - Heating

Question 27

What can visible light be used for?

Answer 27

- Cameras - Seeing

Question 28

What can ultraviolet light be used for?

Answer 28

- Detecting fake money - Tanning beds

Question 29

What can X-rays be used for?

Answer 29

Seeing inside the body e.g. broken bones

Question 30

What can gamma rays be used for?

Answer 30

- Treating cancers - Sterilising bacteria

Question 31

When does diffraction happen?

Answer 31

When a wave passes through a gap Will curve around when passes through gap

Question 32

When does refraction happen?

Answer 32

When a wave passes through one medium into another e.g. air into glass

Question 33

What happens during refraction?

Answer 33

Wave changes direction as the wave changes speed going into another medium Wave changes speed at different points

Question 34

What are good absorbers?

Answer 34

- Dark surfaces - Matt surfaces

Question 35

What are good emitters?

Answer 35

- Dark surfaces - Matt surfaces

Question 36

What are good reflectors?

Answer 36

- Shiny surfaces

Question 37

What is a converging lens?

Answer 37

- Corrects long sightedness - Real image - Magnified

Question 38

What is a diverging lens?

Answer 38

- Corrects short sightedness - Virtual image - Upright - Small

Question 39

How is magnification worked out?

Answer 39

Image height / object height

Question 40

What is the wavelength of red light?

Answer 40

7x10^-7m

Question 41

What is the wavelength of violet light?

Answer 41

4x10^-7m

Question 42

What is the frequency of red light?

Answer 42

4x10^14Hz

Question 43

What is the frequency of indigo light?

Answer 43

7x10^14Hz

Question 44

What is a black body?

Answer 44

An object in space that perfectly absorbs radiation