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The speed of any wave =Frequency *Wavelength

here, frequency =1.49*1017 Hz

& wavelength=6.39 nm

=6.39* 10-9 m

So speed=9.52*108 m/s

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Q: What is the speed of an electromagnetic wave having a frequency of 1.49 1017 Hz and a wavelength of 6.39 nm?
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