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Science · Topic

Waves, sound and light

v = fλ needs consistent units — convert centimetres before multiplying.

1 original question in the bank, worth 3 marks · still building (1 more to reach the floor)

Drill this topic All waves, sound and light questions

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Calculate3 marksIGCSE

A radio station broadcasts at a frequency of 9.0 × 10⁷ Hz. The speed of light is 3.0 × 10⁸ m/s. Calculate the wavelength of the waves.

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Answer: 3.3 m (3.33 m)

  1. v = fλ, so λ = v ÷ f
  2. λ = (3.0 × 10⁸) ÷ (9.0 × 10⁷)
  3. λ = 3.3 m

Examiner technique: Dividing powers of ten: subtract the indices. 10⁸ ÷ 10⁷ = 10¹, leaving 30 ÷ 9, which is 3.3.