Photoelectric effect, atoms, nuclei, radioactivity and elementary particle ideas.
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Q1 · Modern Physics · HARD
A photon of wavelength 400 nm strikes a metal surface with work function 1.8 eV. What is the maximum kinetic energy of the ejected photoelectron? (Use h = 6.63×10⁻³⁴ J·s, c = 3×10⁸ m/s, 1 eV = 1.6×10⁻¹⁹ J)
Q2 · Modern Physics · HARD
The binding energy per nucleon of deuterium (²H) is 1.1 MeV and that of helium (⁴He) is 7.0 MeV. When two deuterium nuclei fuse to form helium, the energy released is approximately: