B: frequency
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A wave has a frequency of 10 kHz. Which pair of values of its speed and wavelength is possible?
Which wave property has the same value for all X-rays travelling in air?
Which range is the approximate range of audible frequencies for a human?
The diagram represents parts of a power station. What is the order of the energy changes taking place?
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A crane lifts a weight of 1000 N through a vertical height of 30 m. It uses 60 000 J of energy. What is the efficienc…