2.1 Waves

Question 1

Examples of transverse waves

Answer 1

Water
EM spectrum
Secondary Eq

Question 2

Examples of longitudinal waves

Answer 2

Sound
Ultrasound

Question 3

Phase difference definition

Answer 3

The fraction of a complete cycle between 2 points on a wave

Question 4

Definition of polarisation

Answer 4

Confining vibrations of a wave to a single plane

Question 5

How to polarise a wave

Answer 5

Place a polarising filter in front of source
Add a second polarising filter and rotate it 90 degrees
If no waves get through wave extinction has happened

Question 6

List EM spectrum in order of decreasing wave length

Answer 6

Radio
Micro
Infra red
Visible light
UV
X ray
Gamma ray

Question 7

What is the wavelength of violet light

Answer 7

400nm

Question 8

What is the wavelength of red light

Answer 8

700nm

Question 9

Equation for frequency (time)

Answer 9

f = 1/T

T= time period

Question 10

Wave Equation

Answer 10

v = f&

Question 11

Wavelengths of EM spectrum waves

Answer 11

R : >10-1
M : 10-1 10-3
Inf r : 10-3 7x10-7
Vl : 7x10-7 4x10-7
UV : 4x10-7 10-8
X r : 10-8 10-12
G r : <10-12

Question 12

Explain what is meant by in phase

Answer 12

Corresponding points on the wave are lined up with corresponding time

Question 13

Equation for finding phase difference of 2 points on a wave that aren’t given by axis

Answer 13

x/L .360

x = distance between 2 points
L = wavelength

Question 14

Mechanical wave

Answer 14

Oscillations in a physical medium, they cannot transfer energy in a vacuum

Question 15

Wave

Answer 15

Periodic disturbance in a medium or space which transfers energy