Dual Nature of Radiation and Matter

Question: If the wavelength of light is 4000 Å, then the number of waves in 1 mm length will be



1) 25
2) 0.25
3) $0.25 \times {10^4}$
4) $25 \times {10^4}$
Solution: Explanation: No Explanation
Photon and Photoelectric Effect

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