If the wavelength of an electromagnetic radiation is20000A . What is the energy in ergs?

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9.94×10−12

9.94×10−10

4.97×10−12

4.97×10−19

answer is A.

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Detailed Solution

λ=2000A0 =2000×10−8 cm =2×10−5 cm E=hcλ =6.6×10−27×3×10102×10−5 erg =9.94×10−12 erg

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