Level Four Physics - Sounds and Waves

Question 1

What do waves carry from place to place and can therefore be used to transmit signals?

Answer 1

Energy

Question 2

What is frequency?

Answer 2

Number of waves passing a point each second.

Question 3

What is frequency measured in?

Answer 3

Hertz, (Hz)

Question 4

What is the symbol for frequency?

Answer 4

f

Question 5

How to calculate frequency?

Answer 5

Frequency= number of waves/ time

F=N/t

Question 6

What is wavespeed?

Answer 6

Distance travelled by a wave in one second

Question 7

What is wavespeed measured in?

Answer 7

metres per second (m/s or ms-1)

Question 8

What is the symbol for wavespeed?

Answer 8

v

Question 9

How to calculate wavespeed?

Answer 9

speed = distance travelled / time taken

v= d/t

Question 10

What is amplitude?

Answer 10

Half the height of a wave

Question 11

What is amplitude measured in?

Answer 11

metres, m

Question 12

What is the symbol for amplitude?

Answer 12

A

Question 13

What is wavelength?

Answer 13

Distance from one point on a wave to the same point on the next wave

Question 14

What is wavelength measured in?

Answer 14

meters, m

Question 15

What is the symbol for wavelength?

Answer 15

lambda, λ

Question 16

How to calculate wavelength?

Answer 16

λ= d/N

d is distance
N is number of waves in that distance

Question 17

What is period?

Answer 17

Time taken for one wave to pass a point

Question 18

What is period measured in?

Answer 18

Seconds, s

Question 19

What is the symbol for Period?

Answer 19

T

Question 20

How to calculate period?

Answer 20

Period = time / number of waves

T= 1/f

Question 21

What is a Transverse wave?

Answer 21

The energy transferred by the waves is at right angles to the motion of the particles

Question 22

Types of transverse waves

Answer 22

1. Light
2. Microwave
3. UV
4. Gamma Ray
   5> X-rays
5. infrared
6. TV and radio waves

Question 23

What is a Longitudinal wave?

Answer 23

The energy transferred by the wave is in the same direction as the particle motion.

Question 24

Type of longitudinal wave

Answer 24

1. Sound

Question 25

Which is faster the speed of sound in air, or the speed of light in air?

Answer 25

Speed of Light

Question 26

What is the Speed of sound in air?

Answer 26

340m/s

Question 27

What is the Speed of light in air?

Answer 27

300,000,000 m/s or 3 x 10^8m/s

Question 28

Speed, Distance and Time

Answer 28

d=vt

Question 29

The Wave Equation

Answer 29

v=f λ

Question 30

Quiet note

Answer 30

Small amplitude

Question 31

Loud note

Answer 31

Large amplitude

Question 32

Low pitch note

Answer 32

low frequency

Question 33

High pitch note

Answer 33

high frequency

Question 34

Sound can travel through

Answer 34

1. A solid
2. A liquid
3. A gas

Question 35

Sound can’t travel through

Answer 35

1. A vacuu,

Question 36

What are noise levels are measured in?

Answer 36

Decibels

Question 37

What is the symbol for decibels?

Answer 37

dB

Question 38

Regular exposure to noise levels of what and above can cause damage to hearing?

Answer 38

80 dB

Question 39

0dB

Answer 39

Threshold of hearing

Question 40

60dB

Answer 40

Normal conversation

Question 41

95dB

Answer 41

Heavy lorry

Question 42

100dB

Answer 42

Pneumatic drill

Question 43

130dB

Answer 43

Jet engine

Question 44

140dB

Answer 44

Pain threshold

Question 45

Humans can hear sounds in the range of

Answer 45

20-20000Hz

Question 46

What are ultrasound frequencies?

Answer 46

Sound frequencies above 20,000Hz

Question 47

Non-medical uses of ultrasound

Answer 47

1. Scanning Metal for Flaws
2. Ultrasonic Cleaning
3. SOnar

Question 48

Medical Uses of Ultrasound

Answer 48

1. The Ultrasound Scanner
2. Treating Kidney Stones

Question 49

What speed do all radiations travelled at?

Answer 49

Speed of light - 3x10^8ms-1

Question 50

Electromagnetic spectrum in order of increasing wavelength.

Answer 50

1. Gamma
2. X-Ray
3. Ultraviolet
4. Visible light
5. Infra-red
6. Microwave
7. Radio & TV