Physics Pope

Question 1

Photons

Answer 1

Discrete packets of energy

Question 2

Energy of a photon

Answer 2

E=hf

Question 3

Planck’s constant

Answer 3

6.63 × 10-³⁴ J.s

Question 4

Energy equation using wavelength

Answer 4

E=hc/wavelength

Question 5

Wavespeed equation

Answer 5

f=c/wavelength

Question 6

What makes a wave a wave?

Answer 6

Waves allow energy to transfer from one place to another

Question 7

What do all waves do?

Answer 7

All waves show reflection, refraction, diffraction and interference

Question 8

What do particles all do

Answer 8

Particles have mass and follow the laws of newtonian mechanics

Question 10

Newton’s 1st Law

Answer 10

A body in motion or in rest remains as such, unless acted upon by a force

Question 11

Newton’s 2nd Law

Answer 11

F=ma

Question 12

Newton’s 3rd Law

Answer 12

For every action, there is an equal and opposite reaction

Question 13

High frequency =

Answer 13

High energy

Question 14

Short wavelength =

Answer 14

High energy

Question 15

What is an electron volt

Answer 15

An electron-volt (eV) is a unit of energy equal to the work done when 1 electron is moved through a p.d. of 1 volt

Question 16

Work done

Answer 16

Work done= charge × voltage
E = Q V

Question 17

Electron charge

Answer 17

1.6×10-¹⁹ c

Question 18

1eV

Answer 18

1.6x10-¹⁹ C ×1V
1.6x10-¹⁹ J

Question 19

Mass of an electron

Answer 19

9.11 × 10-³¹ kg

Question 20

Wavelength dictates

Answer 20

The colour of light

Question 21

Intensity dictates

Answer 21

Amount of photons released from light

Question 22

What is the photoelectric effect

Answer 22

The emission of electrons from the surface of a material due to the exposure of the material to electromagnetic radiation of a sufficiently high frequency

Question 23

Stopping voltage

Answer 23

Amount of energy needed to reverse the flow of electrons with minimum energy used

Question 24

Ekmax

Answer 24

Ekmax = hf - Ø

Question 25

Work function

Answer 25

Energy which must be used to release an electron from the metal surface

Question 26

Momentum of photons

Answer 26

p=E/c

Question 27

De broglies wavelength

Answer 27

Wavelength = h/p = h/mv

Question 28

Line spectra

Answer 28

The wavelengths of light emitted from an element when it's electrons lose energy. The energy is lost in the form of photons of certain wavelengths. Occurs when current is passed through ionised gas. (Hydrogen gas).

Question 29

1C =

Answer 29

1/1.6x10-¹⁹

Question 30

Electrical current

Answer 30

The rate of flow of electrons/charge measured in amps

Question 32

Potential difference

Answer 32

Energy ÷ charge

Question 33

Resistance

Answer 33

The opposition of a component to the flow of electric current through it

Question 34

Kirchoffs 1st law

Answer 34

Total current into a junction = total current out of the junction I¹+I²+I³ =0

Question 35

Kirchoffs 2nd law

Answer 35

The sum of the potential difference across the individual components are equal to the sum of the emf from the batteries E¹+E²+E³=I¹R¹ + I²R² + I³R³

Question 36

LDR

Answer 36

Resistor whose resistance decreases with increasing incident light intensity

Question 37

NTC thermistor

Answer 37

Resistor whose resistance decreases as temperature increases

Question 38

Resistance in series

Answer 38

Rt=R¹+R²+R³

Question 39

Resistance in parallel

Answer 39

1/Rt = 1/R¹ + 1/R² + 1/R³

Question 40

Potential divider

Answer 40

I=Vt ÷ Rt

Question 41

Resistivity

Answer 41

p=RA÷L

Question 42

Internal resistance

Answer 42

E=Ir+IR

Question 43

For graphs

Answer 43

V=E-Ir