P5.1

Question 1

What is a wave?

Answer 1

A wave is an oscillation that transfers energy

Question 2

What is an electromagnetic wave?

Answer 2

a wave that consists of oscillating electric and magnetic fields

Question 3

What is a longitudinal wave?

Answer 3

A wave who’s vibration is the same direction of the energy transfer of the waves

Question 4

What is a mechanical wave?

Answer 4

A wave that requires a medium to travel through

Question 5

What is the natural frequency?

Answer 5

The frequency at which an object oscillates if it is displaced

Question 6

What is normal?

Answer 6

A line at 90° to the surface where the wave hits

Question 7

What is a refraction?

Answer 7

The change in direction of a wave when it’s speed changes as a result of going from one medium to another

Question 8

What is a sour wave?

Answer 8

A wave produced by a vibration that needs a medium to travel through

Question 9

What is a transverse wave

Answer 9

A wave whose vibration are at right angles to the direction of transfer energy by the wave

Question 10

What are vibrations?

Answer 10

The backwards and forwards motion of a solid or particles , displaces from an equilibrium position

Question 11

What is wave velocity?

Answer 11

The speed at which the energy of a wave is transferred

Question 12

What is wavelength?

Answer 12

The distance from one point of a wave to the same point on the next wave
Symbol: Lambda
Unit:metres

Question 13

Amplitude

Answer 13

Distance from the middle to the top or bottom of the wave

Symbol: A

Question 14

What is frequency?

Answer 14

The number of waves or oscillations per seconds
Symbol:F
Unit: Herz

Question 15

What is a time period?

Answer 15

The amount of time taken for a wave to pass a given point
Symbol: T
Units: seconds

Question 16

What are the two ways to represent a wave

Answer 16

A time trace or a snapshot
Time trace- shows how displacement varies with time at a particular position
Snapshot: shows how displace,ent varies with distance

Question 17

How do you calculate wave velocity?

Answer 17

Wave velocity (m/#) = frequency(Hz) X wavelength(m)

Question 18

How do you calculate wavelength

Answer 18

Wavelength= wave velocity ➗ frequency

Question 19

If the velocity increases, and the wave length increases, the frequency will stay the same

Answer 19

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Question 20

What will happen to a sound wave that hits the boundary at 0°to the brink,

Answer 20

It will speed up but won’t change direction

Question 21

What happens when a sound wave hits the boundary between two media?

Answer 21

The sound can be:
Reflected ( an echo)
Transmitted
Absorbed

Question 22

What is ultra sound?

Answer 22

Ultrasound is the sound of a frequency greater 20,000 Hz.

It is useful as it has a small wavelength so you can focus it into a beam

Question 23

How can you use ultrasound?

Answer 23

Doctors can use ultrasound to find kidney stones and monitor blood flow.
To find distances such as the depth of water:
The transmitter sends an impulse and calculates the distance from the echo

Echo sounding and sonar (Sound navigation and ranging)

Question 24

What happens when a sound wave hits a solid?

Answer 24

After an echo is reflected many times, the sound is absorbed. This makes the particles in wall vibrate and the wall gets a bit hotter.

Question 25

How does your ear detect sound?

Answer 25

Your ear is designed to detect, amplify and convert sound to an electric signal.

1. The outer ear gathers the sound wave and directs it to the ear drum
2. The ear dum vibrates
3. The vibration passes to the inner ear through the oval window

Question 26

The range of frequencies you hear depends on the range of lengths of hair in your cochlea

Answer 26

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