GCSE Physics

Speed = Frequency × Wavelength

Let's put this new formula to good use by looking at a few more examples:

wave speed = frequency x wavelength. v = f l.
  1. Bill counts 5 waves on a pond in 10 s. The distance between them is 80 cm. What is their speed?
  2. Lizi reads the back label of her microwave oven. It says frequency = 2,450 MHz. The speed of microwaves is 3.00×108 m/s.
    What wavelength are they?
  3. Paul plays a note of wavelength 25 cm on his synthesiser.
    He knows the speed of sound is 340 m/s in air.
    What is its frequency?

Have a go at answering these questions on a piece of paper, then click below for the answers.

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