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Speed = Frequency × Wavelength
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Let's see how you got on:
- 5 waves in 10 s. Distance between is 80 cm. Speed?
frequency = 5/10 = 0·5 Hz.
speed = frequency × wavelength = 0·5 × 80 = 40 cm/s
- frequency = 2,450 MHz. speed = 3.00×108 m/s.
speed = frequency × wavelength
3.00×108 = 2,450×106 × wavelength
wavelength = 3.00×108 ÷ 2,450×106 = 0·122 m = 12·2 cm
- wavelength= 25 cm = 0·25 m. Speed = 340 m/s
speed = frequency × wavelength
340 = frequency × 0·25
frequency = 340 ÷ 0·25 = 1,360 Hz
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Ask your teacher to put a plastic tray of marsh mallows in a microwave for 20 seconds. You should find a gap of about 12 cm between melted marsh mallows!
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