The energy of an electromagnetic radiation is 3×10-12ergs what is its wavelength in nanometers? h=6.625×10-27erg⋅sec,C=3×1010 cm⋅sec-1-1

E=hcλ⇒λ=hcE 3×10-12=6.625×10-27×3×1010λ λ=662.5 nm

E=hcλ⇒λ=hcE 3×10-12=6.625×10-27×3×1010λ λ=662.5 nm

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The energy of an electromagnetic radiation is $3 \times 10^{- 12}$ ergs what is its wavelength in nanometers? $(h = 6 .625 \times 10^{- 27} erg \cdot \sec, C = 3 \times 10^{10} {cm \cdot \sec^{- 1}}^{- 1})$

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400

228.3

3000

662.5

answer is D.

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$E = \frac{hc}{λ} \Rightarrow λ = \frac{hc}{E} 3 \times 10^{- 12} = \frac{6.625 \times 10^{- 27} \times 3 \times 10^{10}}{λ} λ = 662.5 nm$

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