TS EAMCET · Chemistry · Structure of Atom
If the wavelength of an electromagnetic radiation is \(2000 Å\), what is its energy in ergs?
- A \(9.94 \times 10^{-12}\)
- B \(9.94 \times 10^{-19}\)
- C \(4.97 \times 10^{-12}\)
- D \(4.97 \times 10^{-19}\)
Answer & Solution
Correct Answer
(A) \(9.94 \times 10^{-12}\)
Step-by-step Solution
Detailed explanation
\(E=h v, v=\frac{3 \times 10^{10}}{2000 \times 10^{-8}}=1.5 \times 10^{15} \sec ^{-1}\) \(h=6.6 \times 10^{-27}\) erg sec \(E=h v=6.6 \times 10^{-27} \times 1.5 \times 10^{15}=9.94 \times 10^{-12} \mathrm{erg}\)
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