Waves

Question 1

degree (°)

Answer 1

Used for temperature

Question 2

hertz (Hz),

Answer 2

Used for frequency

Question 3

metre (m),

Answer 3

Used for distance

Question 4

metre/second (m/s)

Answer 4

Used for velocity

Question 5

second (s)

Answer 5

Used for time

Question 6

Longitudinal Wave

Answer 6

A wave in which the direction of movement is parallel to the direction of energy

Question 7

Transverse Wave

Answer 7

A transverse wave is when the OSCILLATIONS travel PERPENDICULARLY (at right angles) to the direction of the wave

Question 8

Amplitude =

Answer 8

the distance from the midpoint to the peak of a wave

Question 9

What is wavelength

Answer 9

The distance between two corresponding points on the wave and is measured in metres

Question 10

What is frequency

Answer 10

how many waves pass by a point every second and is measured in Hertz (Hz)

Question 11

What is the Doppler Effect

Answer 11

The doppler effect is when the spurce moves towards the stationary observer, the wave fronts bunch up. This causes the wavelength to decrease and the frequency to increase. As the source moves past/away from the observer, the wavefronts spread out, the wavelength increases and the frequency decreases

Question 12

What do all waves have in common

Answer 12

They can all be reflected and refracted

Question 13

Electromagnetic radiations:

Answer 13

1. radio waves
2. micro waves
3. infra-red radiation
4. visible light
5. ultraviolet
6. x-rays
7. gamma rays

Question 14

Uses of electromagnetic radiations:

Answer 14

1. radio waves - broadcasting and communications
2. micro waves - cooking and satellite tranmissions
3. infra-red radiation - heaters and night vision equipment
4. visible light - optical fibres and photographgy
5. ultraviolet - fluorescent lamps
6. x-rays - observing internal structure of objects and materials
7. gamma rays - medical equipment

Question 15

Negative effects of excessive exposure to electromagentic waves:

Answer 15

• microwaves; internal heating of body tissue
• infrared; skin burns
• ultraviolet; damage to surface cells and blindness
• gamma rays; cancer, mutation

Question 16

Light waves are transeverse or longitudinal?

Answer 16

Transverse

Question 17

Angle of incidence is equal to

Answer 17

the angle of reflection

Question 18

Describe the role of total internal reflection in transmitting information along optical fibres and in prisms

Answer 18

The light ray passes along the core at an angle greater than the critical angle. This then means the light ray is continuously reflected along the lengths of the optical fibre core.

Question 19

What is critical angle?

Answer 19

The angle of incidence for which the angle of refraction is 90 degree

Question 20

Sound waves are transeverse or longitudinal?

Answer 20

Longitudinal

Question 21

Frequency range for hearing in humans?

Answer 21

20Hz - 20 000Hz

Question 22

Understand how an oscilloscope and microphone can be used to display a sound wave

Answer 22

The microphone will transfer the sound into an electrical signal which the oscilloscope can display .The x axis show the time base, along the y axis voltage is displayed. These make the wave

Question 23

What does frequency relate to?

Answer 23

High frequency means high pitch.

Question 24

What does amplitude relate to?

Answer 24

The greater the amplitude the louder the sound.