In electromagnetic wave theory concept, the energy Q is (where h is Planck’s constant, λ is wavelength and c is velocity.)
- Ahc / λCorrect
- Bλc / h
- Ch / λc
- Dλh / c
Solution
Concept
Quantum energy
Formula
Q = h ν = h c / λ
Step-by-step solution
1. Frequency ν = c / λ. 2. Q = h ν = h c / λ.
Explanation
The energy of a photon is inversely proportional to its wavelength, so short-wavelength radiation carries more energy.
Why the other options are wrong
The other expressions do not give energy (wrong dimensions).
Shortcut
Q = hc/λ.
Common mistake
Inverting the ratio.
Correct answer: A) hc / λ