Physics

Question 1

What is a progresive wave?

Answer 1

A wave that transports energy from one place to another

Question 2

Where is the amplitude on a wave?

Answer 2

The amplitude is the distance from rest to crest.

Question 3

Where is the wave length on a wave?

Answer 3

The distance between a point on one wave and the same point on the next wave.

For example, peak to peak.

Question 4

What is the frequency?

Answer 4

Amount of waves per second

Question 5

What does v=fλ mean?

Answer 5

Wave speed (v) is measured in metres per second (m/s) Frequency (f) is measured in Hertz (Hz) wavelength (λ) is measured in metres (m)

Wavespeed= Frequency x Wavelength

Question 6

How do you calculate frequency from Time

Answer 6

Frequency=1 / T

Question 7

Define isotope

Answer 7

Isotopes are atoms of an element with different numbers of neutrons

Question 8

What is a longitudinal wave?

Answer 8

• The medium moves in the same direction of the wave
• It acts in one dimension
• It is made of rarefactions and compressions

Question 9

What is a transverse wave?

Answer 9

• The medium is moving perpendicular to the direction of wave. At 90°
• It acts in two dimensions
• It is made of troughs and crests

Question 10

What is phase difference?

Answer 10

The difference in phase angle between two waves of the same frequency and wavelength, where 360° represents a single whole cycle of the wave form.

Question 11

How many radians are in 360°?

Answer 11

6

Question 12

What is 360° convert to in terms of radians?

Answer 12

2 π Radians

Question 13

What must be the same be for phase difference to happen?

Answer 13

Wavelength and frequency

Question 14

What are coherant waves?

Answer 14

Waves that are in phase

Question 15

What is the equation for photon energy?

Answer 15

E=HF

Energy= Plancks constant x Frequency

Question 16

What is the ground state?

Answer 16

The lowest energy state of an electron

Question 17

What is the energy level of an electron?

Answer 17

One of the fixed values of energy for an electron that is bound to an atom.

Question 18

What is light made up of?

Answer 18

Packs of energy called photons.

Question 19

What is the equation to work out N lambda?

Answer 19

n λ = d sin θ

n lambda = d sin theta

Question 20

What is the definition for frequency?

Answer 20

F=1/T

Question 21

What is the displacement?

Answer 21

How far the quantity that is in oscillation has moved from its mean

Question 22

What is the oscillation

Answer 22

A regularly repeating motion about a central value

Question 23

What is a period

Answer 23

The time taken for one whole cycle of an oscillation

Question 24

How do you work out wave speed?

Answer 24

V=Fxlambda

Question 25

What is frequency measured in?

Answer 25

Hertz (H)

Question 26

Give an example of a longitudinal and transverse wave

Answer 26

Sound waves and water ripples

Question 27

What is diffraction?

Answer 27

The tendency of a wave to spread out in all directions

Question 28

What is a diffraction grating?

Answer 28

Flat plane object with a series of regular lines that blocks parts of an advancing wave front

Question 29

What is transmission?

Answer 29

When some of the waves energy continues propagating forward through the gaps between the grating lines

Question 30

What is superposition?

Answer 30

The adding together of wave displacements that occurs when two waves overlap

Question 31

What is path difference?

Answer 31

The difference in length between two rays

Question 32

What is the interference pattern?

Answer 32

A stationary pattern that can result from the superposition of waves travelling in different directions

Question 33

Define coherent

Answer 33

Used to describe waves whose superposition gives a visible interference pattern

Question 34

Explain the gratings in reflection mode in the diffraction grating

Answer 34

- You look at the part of the wave energy that is bounced back off the surface - The grating lines are regularly spaced so an interference pattern is produced

Question 35

What is a stationary wave?

Answer 35

When energy is stored rather than transferred

Question 36

What is resonance

Answer 36

The storing of energy in an oscillation or a stationary wave

Question 37

What is a node?

Answer 37

Points of minimum amplitude

Question 38

What is an antinode?

Answer 38

Points if maximum amplitude

Question 39

What is resonance

Answer 39

When the wave energy coming in from outside has a forcing frequency equal to the natural frequency of the resonator

Question 40

What is the refractive index?

Answer 40

N=C/V Index of refraction= Speed of light in vacuum/ Speed of light in medium

Question 41

What is the critical angle?

Answer 41

When the angle of refraction is equal to 90 degrees.

Question 42

What is total internal reflection?

Answer 42

When the angle of incidence is greater than the critical angle, the light cannot pass through the surface- it is all reflected.

Question 43

What is the angle of incidence?

Answer 43

The angle between the normal and the ray of light.

Question 44

What is an optical fibre?

Answer 44

A thin flexible fibre with a glass core through which light signals can be sent with very little loss of strength.

Question 45

What is an endoscope?

Answer 45

Optical instruments with long tubes that can be inserted into the body through an opening. Used during keyhole surgery.

Question 46

What are the 2 types of signals?

Answer 46

Analogue and digital

Question 47

What is an analogue signal?

Answer 47

A signal whose strength is proportional to the quantity it is representing

Question 48

What is a digital signal?

Answer 48

A digital signal is a signal that represents data as a sequence of discrete values. It is possible to send data much faster than an analogue signal.

Question 49

Define broadband

Answer 49

Used as a relative term to indicate the speed and carrying capacity if a data channel.

Question 50

Define broadband

Answer 50

Used as a relative term to indicate the speed and carrying capacity if a data channel.

Question 51

What is multimode fibre?

Answer 51

The standard fibre cable used for sending optical signals over short to medim distances.

Question 52

What is single mode fibre?

Answer 52

Has a more narrower core, light moves as a single wave front straight down the centre of the fibre. Used for long distance

Question 53

What is the speed of light?

Answer 53

3x10 to the power of 8

Question 54

What is the only frequency that the naked eye can see?

Answer 54

Visible light