Physics - Waves

Question 1

Radio waves

Answer 1

Electrons vibrate sending out EM waves that make different electrons vibrate at the same frequency in receiving antenna ; transferring energy (no electrons are transferred)

Question 2

Waves transfer

Answer 2

Energy and not matter

Question 3

Transverse

Answer 3

Vibration direction is perpendicular to the wave direction

Question 4

Longitudinal waves

Answer 4

Vibration direction is parallel to wave direction

Question 5

Transverse waves

Answer 5

EM waves
Waves on a string
Seismic S-waves

Question 6

Longitudinal

Answer 6

Sound
Ultrasound
Compression waves on a slinky
Seismic P-waves

Question 7

Water waves

Answer 7

Mixture of transverse and longitudinal waves so particles of water move vertically and horizontally as the wave passes

Question 8

Compression

Answer 8

Longitudinal - particles are pushed closer as wave passes

Question 9

Rarefaction

Answer 9

Particles in medium are pulled further apart as wave passes

Question 10

Compressions

Answer 10

Higher pressure than atmospheric

Question 11

Rarefactions

Answer 11

Lower pressure than atmospheric

Question 12

Frequency formula

Answer 12

1/time taken for one cycle (Hz)

Question 13

Mechanical waves

Answer 13

Vibrating particles so they can only move through a material medium ; cannot travel through a vacuum

Question 14

EM waves

Answer 14

No material medium needed ; can travel through vacuum

Question 15

EM waves

Answer 15

Speed of light

Question 16

EM spectrum

Answer 16

Radio, micro, infra-red, visible, uv, x-ray, gamma rays

Question 17

Gamma

Answer 17

Short wavelength
High frequency

Question 18

Mechanical waves

Answer 18

Ultrasound /seismic waves/water waves

Question 19

Nature of EM waves

Answer 19

Charged particles, electrons, set up an electric field in the space around them ; magnetic field also produced when they vibrate and this pattern of electric field and magnetic field travels outwards as an EM wave

Question 20

Wavelength

Answer 20

Distance between adjacent peaks or compressions (longitudinal)

Question 21

Amplitude

Answer 21

Maximum displacement from equilibrium

Question 22

Period

Answer 22

Time taken for one vibration

Question 23

Frequency

Answer 23

Number of oscillations per unit time

Question 24

Frequency

Answer 24

Number of cycles/second

Question 25

Wavelength

Answer 25

Distance moved by the sample in one cycle

Question 26

Frequency

Answer 26

1/period

Question 27

Time period

Answer 27

1/frequency

Question 28

Wave speed =

Answer 28

Distance/time

Question 29

Wave speed =

Answer 29

Frequency * wavelength