Calculate the frequency of the radiation having wavelength 2400Å
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We know that 1 Angstrom = 10^-10 m
And frequency = speed of light in vaccum / wavelength
=> Frequency = 3 × 10^8/2400×10^-10
= 3×10^8/24×10-8
=> Frequency = 10¹⁶/8 = 1.25×10¹⁵
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