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V=f *lambda where v = wave speed, f=frequency and lambda= wavelength.
Frequency increase as the energy of a wave increases because E=hf where h is a constant so E/h=f. if E increase f has to increase.
Wavelength decreases because if the frequency increases the wavelength would also have to decrease as v/f=lambda. Therefore the larger the frequency is the smaller the wave lengthen will be.
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