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Physics

Waves & Sound

Key Points

  • Wave speed v = fλ; Period T = 1/f
  • Transverse waves: oscillation perpendicular to travel direction
  • Sound speed in air ≈ 340 m/s; cannot travel in vacuum
  • EM spectrum: Radio → Micro → IR → Visible → UV → X-ray → Gamma
  • All EM waves travel at c = 3 × 10⁸ m/s in vacuum

Key Formulas & Facts

Wave Speed
v = fλ
Period
T = 1/f
Speed of Light
c = 3 × 10⁸ m/s
Snell's Law
n₁ sin θ₁ = n₂ sin θ₂

Practice Questions

3 questions
1

A wave has a frequency of 500 Hz and a wavelength of 0.68 m. What is its speed?

2

Which of the following electromagnetic waves has the shortest wavelength?

3

The critical angle for total internal reflection in glass is 42°. What is the refractive index of the glass?

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