3.1 Waves

Question 0

How are waves generated?

Answer 0

By causing particles to move/vibrate.

Question 1

What does a wave do?

Answer 1

Transfers energy.

Question 2

What is a transverse wave in relation to the direction of travel of the wave and the direction of movement of particles?

Answer 2

the direction of travel of the wave is perpendicular to the direction of movement of particles.

Question 3

What is a longitudinal wave in relation to the direction of travel of the wave and the direction of movement of particles?

Answer 3

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

Question 4

Can transverse waves travel through a vacuum?

Answer 4

yes

Question 5

Can longitudinal waves travel through a vacuum?

Answer 5

no

Question 6

Give examples of longitudinal waves…

Answer 6

sound

Question 7

Give examples of transverse waves…

Answer 7

• infrared
• visible light
• ultraviolet
• TV
• radio
• microwaves

Question 8

What is the crest of a wave?(2)

Answer 8

• point of maximum displacement

- highest point of a wave

Question 9

What is the trough of a wave? (2)

Answer 9

• point of minimum displacement

- lowest point of a wave

Question 10

What is the amplitude of a wave? (2)

What is the symbol and unit?

Answer 10

• vertical distance from the zero line to either the crest or the trough
• gives a measure of the quantity of energy wave possesses
• A
• metres (m)

Question 11

what is the wavelength of the wave? (2)

What is the symbol and unit?

Answer 11

• length of one complete wave
• horizontal distance between the same point on consecutive waves
• landa
• metres (m)

Question 12

What is the frequency? What is the unit and symbol?

Answer 12

• number of waves that pass a point in one second
• f
• hertz (Hz)

Question 13

What is the time period? What is the unit and symbol?

Answer 13

• time taken for one complete wave to pass a point
• T
• seconds (s)

Question 14

What is the equation linking number of waves, frequency and time?

Answer 14

N=ft

number of waves=frequency times time

Question 15

What is the equation linking frequency and time period?

Answer 15

f=1/T

T=1/f

Question 16

What is the equation linking speed, frequency and wavelength?

Answer 16

v=f(landa)

speed equals frequency times wavelength

Question 17

What three things link the members of the electromagnetic spectrum?

Answer 17

• all transverse
• all travel through vacuums
• all travel at 3x10^8 m/s

Question 18

Give the members of the electromagnetic spectrum in order of wavelength shortest to longest…

Answer 18

Gamma Rays, x-rays, ultraviolet, visible light, infrared, microwaves, television, radio

Question 19

Give the colours in order of wavelength shortest to longest that make up visible light…

Answer 19

violet, indigo, blue, green, yellow, orange, red

Question 20

Give the members of the electromagnetic spectrum in order of frequency low to high…

Answer 20

radio, television, microwaves, infrared, visible light, ultraviolet, x-ray, gamma rays.

Question 21

Describe a setup to measure the speed of sound in air…

Answer 21

1) place two microphones 1m apart both connected to an electrical timer
2) use a pin to pop a balloon.
3) timer starts when first microphone detects sound wave
4) timer stops when second microphone detects sound wave
5) speed of sound calculated using v=d/t
6) repeat and use an average

Question 22

What is the speed of sound in air?

Answer 22

340m/s