Atomic nucleus and radioactivity; binding energy; fission and fusion; photoelectric effect; Bohr's theory of hydrogen-like atoms; X-rays; matter waves.
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Q1 · Modern Physics · MEDIUM
In a photoelectric effect experiment, light of wavelength 400 nm is incident on a metal surface with work function 1.8 eV. The maximum kinetic energy of the ejected photoelectrons is (take h = 6.6 × 10⁻³⁴ J·s, c = 3 × 10⁸ m/s, 1 eV = 1.6 × 10⁻¹⁹ J):
Q2 · Modern Physics · HARD
A helium atom absorbs a photon of wavelength 310 nm. Assuming momentum is conserved during photon absorption, the change in velocity (in cm/s) of the helium atom is approximately: (Use: h = 6.6 × 10⁻³⁴ J·s, Avogadro number = 6 × 10²³ mol⁻¹, molar mass of He = 4 g/mol)