defence exam Army Havildar SAC Mock Test Series 2025 Physics Dual Nature: Photon and Matter Waves Einstein’s Photoelectric Equation
Sodium and Copper have work functions 2.3 eV and 4.6 eV respectively. Then the ratio of the wavelength is approximately _______.
1
1 : 2
2
2 : 1
3
4 : 1
4
1 : 4