Waves

Question 1

Amplitude

Answer 1

Maximum displacement from the centre

Question 2

Wavelength

Answer 2

Distance between on point on a wave to the same point on the next wave.

Question 3

Transverse Wave…

Answer 3

• Oscilates perpendicular to the energy transfer
• Doesn’t require medium for travel
• E.g Light or EM waves

Question 4

Longitudinal Waves…

Answer 4

• Oscilate parrallel to energy transfer
• Reqires medium to travel through
• E.g sound or seismic (vibrations) waves

Question 5

wave speed equation

Answer 5

wave speed = frequency X wavelength

wave speed = 1/time period X wavelength

Question 6

what are the units for wave speed, Frequency and Wavelength?

Answer 6

WS = meters per second (m/s)
F = Hertz (Hz)
WL = Lamda (λ)

Question 7

Frequncy equation

Answer 7

Frequency = 1/time period

Frequency = wave speed/ wavelength

Question 8

the speed of light and EM waves in a vaccum is always equal to…

Answer 8

3 X 10^8 m/s

Question 9

The EM spectrum from highest frequency to lowest.

Answer 9

• Gamma Rays
• X-Rays
• Ultra-Voilet
• Visible Light
• Infared
• Microwaves
• Radio Waves

Question 10

what does the PIE symbole represent?

Answer 10

π = Radian

JUST THE SYMBOL, NOT ACTUALLY PIE!!!!!!!!

Question 11

Phase difference

Answer 11

When two waves have the same frequency and wavelength PD tells us the difference in phase angle between the waves.

Question 12

AntiPhase

Answer 12

if two waves are in antiphase they will have a phase difference of 180degrees.

This means the peaks will over lap with the troughs.

Question 13

cheese

Answer 13

cheese

Question 13

Coherent Waves

Answer 13

Waves that have a constant pahse difference with one another.

Can only be coherent with same wavelength and frequency.

Coherent waves can interfere constructively and destructively.

Question 14

path difference

Answer 14

difference in distance travelled by two waves from their sources to a given point.

Question 15

Constructive interference…

Answer 15

Will take place when the peaks of one wave line up with the peaks of the other wave.

Will take place if path difference is equal to nλ

Question 16

Destructive interference…

Answer 16

Will take place when the peaks of one wave line up with the troughs of the other wave.

Will take place if the path difference is equal to n/2 λ

Question 17

Diffraction

Answer 17

Changes the direction of a wave and causes it to spread

occurs when a wave:

passes an edge

passes through a narrow gap

goes past an object

Question 18

Does diffraction change the properties of waves?

Answer 18

None of the properties of a wave are changed by diffraction!!!!!!

The wavelength, frequency, period and speed are the same before and after diffraction.

The only change is the direction in which the wave is travelling.

Question 19

Superposition

Answer 19

When two waves interfere, the amplitude of the resultant wave is found by adding the amplitudes of the two individual waves

This is known as superposition

can result in constructive or destructive interference

Question 20

Double slit

Answer 20

When a wave passes through two gaps and diffracts, this is known as double slit diffraction

Single slit diffraction is a wave passing through one gap.

This results in wave interference both constructive and destructive.

Question 21

Diffraction grating

Answer 21

A large number of evenly spaced parallel slits.

Question 22

What is white light made of?

Answer 22

Made up of all colours on the rainbow

Red has the longest wavelength

Violet has the highest frequency

Question 23

Refraction

Answer 23

When a wave moves through a medium and changes speed/direction

Question 24

Electrons will _____ radiation of a given frequency to go up an energy level

Answer 24

Electrons will absorb radiation of a given frequency to go up an energy level

Question 25

Electrons will ______ radiation of a given frequency to go down an energy level

Answer 25

Electrons will emit radiation of a given frequency to go down an energy level