Final exam deck

Question 1

Power (general physics)

2 formulae

Answer 1

P = work done / time takes

or

P = energy transfer / time taken

Question 2

Pressure due to a liquid

formula + atmospheric pressure at sea level

Answer 2

p = d x g x h

p is pressure in pascals
d is density in kg/m^3
h is the depth or height of the liquid

atmospheric pressure at sea level: 101,000 Pa

Question 3

Thermal capacity

2 formulae

Answer 3

Thermal capacity = m x c

or

Thermal capacity = Q / ∆t

m is mass in kg
c is specific heat capacity in J/(kgºC)
Q is heat energy supplied in J
∆t is change in temperature

Question 4

Specific latent heat of fusion

Answer 4

L = Q / m

L is specific latent heat of fusion in J/kg
Q is total heat in J
m is mass of state change in kg

Question 5

Emitters, Radiators and Reflectors

another name for radiation

Answer 5

dull black is a good radiator and emitter but bad reflector

shiny white is a good reflector but bad emitter and radiator

(infrared heat)

Question 6

Refractive index (n)

2 formulae

Answer 6

n = sin iº in air or vacuum / sin rº in material

or

n = speed of light in air / speed of light in material

Question 7

Image from a convex lens (rule)

Answer 7

close: virtual, enlarged, upright
far: real, small, upside down

Question 8

Electromagnetic spectrum

Answer 8

^ wavelength decreases and frequency increases

1. Gamma-rays
2. X-rays
3. Ultraviolet rays
4. Visible light rays
5. Infrared rays
6. Microwaves
7. Radio waves

Question 9

Echo

Answer 9

v = 2d / t

Question 10

Diffraction rules x 3

Answer 10

1. Greater frequency results in greater diffraction and more wave crests (cycles/frequency)
2. Greater gap results in less diffraction
3. Greater wavelength results in greater diffraction

Question 11

Ferrous (4) /Non-ferrous materials (5)

Answer 11

iron, steel, nickel, cobalt / copper, silver, aluminium, wood, glass

Question 12

Electrical field intensity

Answer 12

E = f / Q

E is the electrical field intensity (N/C)
f is the amount of force exerted by the charge
Q is the unit charge

Question 13

Current : rate of flow of charges in a conductor

Answer 13

I = Q / t

Question 14

Voltage (potential difference)

Answer 14

V = Energy (e) / Charge (Q)

energy per unit charge in J
charge in c
voltage in v

Question 15

Resistance of a resistor

Answer 15

R = p x (L / A)

R is the resistance of the resistor
p is the resistivity of the resistor in ohms
L is the length of the resistor in m
A is the cross-sectional area of the resistor in m^2

Question 16

Power (W)

3 formulae

Answer 16

P = I x V

P = I^2 x R

P = V^2 / R

Question 17

Transformers

3 formulae

Answer 17

Pp = Vp x Ip
Ps = Vs x Is

Vp / Vs = Np / Ns

Ps = Pp hence
Vp x Ip = Vs x Is

Question 18

Isotope examples

Answer 18

Hydrogen, Deuterium, Tritium