Photoelectric effect, Einstein's equation, de Broglie wavelength, Davisson-Germer.
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Q1 · Dual Nature of Radiation and Matter (Class 12) · MEDIUM
In a photoelectric effect experiment, light of wavelength 4000 Å falls on a metal surface. The maximum kinetic energy of the emitted photoelectrons is 1.2 eV. If light of wavelength 3000 Å is incident on the same surface, what will be the maximum kinetic energy of the photoelectrons? (Given: h = 6.63 × 10^-34 J·s, c = 3 × 10^8 m/s, 1 eV = 1.6 × 10^-19 J)
Q2 · Dual Nature of Radiation and Matter (Class 12) · EASY
The de Broglie wavelength of an electron accelerated through a potential difference of 100 V is approximately: (Given: mass of electron = 9.1 × 10^-31 kg, charge of electron = 1.6 × 10^-19 C, h = 6.63 × 10^-34 J·s)
Q3 · Dual Nature of Radiation and Matter (Class 12) · HARD
In the Davisson-Germer experiment, electrons are accelerated through a potential difference and directed at a nickel crystal. At a particular accelerating voltage, a strong peak in the scattered electron intensity is observed at an angle of 50° from the incident direction. If the interplanar spacing of the nickel crystal is 0.91 Å and the first-order diffraction (n=1) is observed, what is the approximate accelerating voltage? (Given: h = 6.63 × 10^-34 J·s, mass of electron = 9.1 × 10^-31 kg, charge = 1.6 × 10^-19 C)
Q4 · Dual Nature of Radiation and Matter (Class 12) · MEDIUM
The work function of a metal is 3.0 eV. When light of wavelength 4000 Å is incident on it, the maximum kinetic energy of the emitted photoelectrons is (h = 6.63 × 10⁻³⁴ J·s, c = 3 × 10⁸ m/s, 1 eV = 1.6 × 10⁻¹⁹ J)