The Real Deal

Question 1

Relationship between intensity and amplitude of a wave.

Answer 1

Intensity is proportional to amplitude squared.

Question 2

Relationship between intensity and distance.

Answer 2

Intensity is inversely proportional to the square of the distance travelled.

Question 3

Circuit diagram for a potentiometer.

Answer 3

Just look it up. Component in parallel with a resistor with a wire meeting the resistor at a point that can be slid to vary resistance.

Question 4

Equation relating resistivity of a material and its temperature.

Answer 4

ρ₁ = ρ₀ [1 + α(T₁ - T₀)]
ρ₁ = ρ₀ + ρ₀ α (ΔT)
Δρ = ρ₀ α (ΔT)

Question 5

The two quantities that could appear on the numerator of the square root in a simple harmonic motion equation.

Answer 5

l, length of pendulum, or m, mass at end of spring.

Question 6

The two quantities that could appear on the denominator of the square root in a simple harmonic motion equation.

Answer 6

g, the field strength acting on the pendulum, or k, the spring constant.

Question 7

Typical OOM for number density of a conductor.

Answer 7

e28

Question 8

Typical OOM for number density of a semiconductor.

Answer 8

e9

Question 9

Symbol for a thermistor.

Answer 9

Resistor with line passing through, tail end of line is parallel to resistor.

Question 10

Symbol for varying resistor.

Answer 10

Resistor with arrow passing through at an angle.

Question 11

Particles that are leptons.

Answer 11

Electrons, muons, tauons and neutrinos.

Question 12

Particles that are hadrons.

Answer 12

Protons and neutrons. (2+ quarks).

Question 13

Kirchhoff’s second law.

Answer 13

Sum of PDs across a loop is equal to the EMF.

Question 14

Boyle’s law.

Answer 14

PV relation: Pressure is inversely proportional to volume provided temperature remains constant.

Question 15

Charles’ law.

Answer 15

VT relation: Volume is proportional to temperature provided that pressure remains constant.

Question 16

Gay-Lussac’s law.

Answer 16

PT relation: Pressure is proportional to temperature provided that volume remains constant.

Question 17

Weak nuclear force.

Answer 17

Responsible for radioactive decay, decay of quarks.

Question 18

Strong nuclear force.

Answer 18

Holds together quarks and nucleons at an optimal distance of 0.5 fm. (look it up)

Question 19

What other particle is emitted when an electron is emitted from a reaction.

Answer 19

An antineutrino will also be emitted (more specifically a positron).

Question 20

Diffracting grating equation.

Answer 20

n λ = d sin(θ) where d is separation between slits.

Question 21

Stationary wave conditions.

Answer 21

• Two waves travelling in opposite directions.
• Identical frequencies.
• Similar amplitudes.

Question 22

Stationary wave definition.

Answer 22

A stationary wave is one which has its energy confined to a fixed position.

Question 23

Law for intensity of a wave through a polariser (law name and equation).

Answer 23

Malus’s law; I₁ = I₀ cos(θ)²

Question 24

Equation for capacitance between two plates.

Answer 24

C = ε A / d