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A-Level Physics Practice Questions

Advanced practice questions covering all A-Level Physics topics. Each question includes detailed step-by-step solutions.

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Question 1
Mechanics AS Level

A 0.5 kg object undergoes uniform acceleration from 2 m/s to 8 m/s over 3 seconds.

Calculate the resultant force acting on the object.

Solution:
  1. Calculate acceleration: a = (v - u) / t = (8 - 2) / 3 = 2 m/s²
  2. Use Newton's 2nd Law: F = ma
  3. Calculate: F = 0.5 × 2 = 1 N
Answer: 1 N
Question 2
Quantum Physics A2 Level

Calculate the energy of a photon with wavelength 500 nm.

h = 6.63 × 10⁻³⁴ J s, c = 3 × 10⁸ m/s

Solution:
  1. Convert wavelength: 500 nm = 500 × 10⁻⁹ m = 5 × 10⁻⁷ m
  2. Use: E = hf = hc/λ
  3. Calculate: E = (6.63 × 10⁻³⁴ × 3 × 10⁸) / (5 × 10⁻⁷)
  4. E = 3.98 × 10⁻¹⁹ J
Answer: 3.98 × 10⁻¹⁹ J
Question 3
Waves AS Level

Two waves meet with amplitudes 4 cm and 3 cm in phase.

Calculate the resultant amplitude.

Solution:
  1. When waves are in phase, they undergo constructive interference
  2. Resultant amplitude = sum of individual amplitudes
  3. Calculate: A_resultant = 4 + 3 = 7 cm
Answer: 7 cm
Question 4
Mechanics A2 Level

A 2 kg mass rotates in a horizontal circle of radius 0.5 m at 4 rad/s.

Calculate the centripetal force.

Solution:
  1. Use: F = mrω²
  2. Given: m = 2 kg, r = 0.5 m, ω = 4 rad/s
  3. Calculate: F = 2 × 0.5 × 4² = 2 × 0.5 × 16 = 16 N
Answer: 16 N
Question 5
Electric Fields Challenge

Calculate the electric field strength at a distance of 2 cm from a +5 μC charge.

ε₀ = 8.85 × 10⁻¹² F/m

Solution:
  1. Convert units: r = 0.02 m, Q = 5 × 10⁻⁶ C
  2. Use: E = Q / (4πε₀r²)
  3. Or: E = kQ/r² where k = 9 × 10⁹ N m²/C²
  4. Calculate: E = (9 × 10⁹ × 5 × 10⁻⁶) / (0.02)²
  5. E = 45000 / 0.0004 = 1.125 × 10⁸ N/C
Answer: 1.13 × 10⁸ N/C
Question 6
Quantum Physics A2 Level

The work function of a metal is 3.2 × 10⁻¹⁹ J.

Calculate the threshold frequency. (h = 6.63 × 10⁻³⁴ J s)

Solution:
  1. At threshold frequency: E = φ = hf₀
  2. Rearrange: f₀ = φ / h
  3. Calculate: f₀ = (3.2 × 10⁻¹⁹) / (6.63 × 10⁻³⁴)
  4. f₀ = 4.83 × 10¹⁴ Hz
Answer: 4.83 × 10¹⁴ Hz
Question 7
Waves Challenge

In Young's double slit experiment, slits are 0.5 mm apart, screen is 2 m away.

Light of wavelength 600 nm is used. Calculate the fringe separation.

Solution:
  1. Convert units: d = 0.5 × 10⁻³ m, D = 2 m, λ = 600 × 10⁻⁹ m
  2. Use: w = λD / d
  3. Calculate: w = (600 × 10⁻⁹ × 2) / (0.5 × 10⁻³)
  4. w = (1.2 × 10⁻⁶) / (5 × 10⁻⁴) = 2.4 × 10⁻³ m = 2.4 mm
Answer: 2.4 mm
Question 8
Mechanics Challenge

A 3 kg object moving at 8 m/s collides with a 2 kg stationary object.

After collision, they move together. Calculate their combined velocity.

Solution:
  1. Use conservation of momentum: m₁u₁ + m₂u₂ = (m₁ + m₂)v
  2. Given: m₁ = 3 kg, u₁ = 8 m/s, m₂ = 2 kg, u₂ = 0
  3. Calculate: 3 × 8 + 2 × 0 = (3 + 2)v
  4. 24 = 5v
  5. v = 4.8 m/s
Answer: 4.8 m/s
Question 9
Magnetic Fields A2 Level

A wire carries 5 A current in a 0.2 T magnetic field.

Calculate the force per metre on the wire (perpendicular to field).

Solution:
  1. Use: F = BIL
  2. Force per metre: F/L = BI
  3. Given: B = 0.2 T, I = 5 A
  4. Calculate: F/L = 0.2 × 5 = 1 N/m
Answer: 1 N/m
Question 10
Quantum Physics Challenge

Calculate the de Broglie wavelength of an electron moving at 2 × 10⁶ m/s.

h = 6.63 × 10⁻³⁴ J s, m_e = 9.11 × 10⁻³¹ kg

Solution:
  1. Use de Broglie equation: λ = h / p = h / (mv)
  2. Given: m = 9.11 × 10⁻³¹ kg, v = 2 × 10⁶ m/s
  3. Calculate: λ = (6.63 × 10⁻³⁴) / (9.11 × 10⁻³¹ × 2 × 10⁶)
  4. λ = (6.63 × 10⁻³⁴) / (1.822 × 10⁻²⁴)
  5. λ = 3.64 × 10⁻¹⁰ m
Answer: 3.64 × 10⁻¹⁰ m (or 0.364 nm)