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)
Q3 · Modern Physics · HARD
In a photoelectric effect experiment, light of wavelength 400 nm is incident on a metal surface. The stopping potential is found to be 1.0 V. If light of wavelength 300 nm is incident on the same surface, the stopping potential (in V) will be approximately: (Given: hc = 1240 eV·nm)