defence exam Navy SSR (Medical) Mock Test Series 2025 Physics Dual Nature: Photon and Matter Waves The Photoelectric Effect
A and B are two metals with threshold frequencies 1.8 × 1014 Hz and 2.2 × 1014 Hz. Two identical photons of energy 0.825 eV each are incident on them. Then photoelectrons are emitted in (Take h = 6.6 × 10−34 Js)
1
B alone
2
A alone
3
neither A nor B
4
both A and B