Monochromatic radiation emitted when electron on hydrogen atom

Monochromatic Radiation Emitted When Electron On Hydrogen Atom Jumps From Physics QuestionMonochromatic Radiation Emitted When Electron On Hydrogen Atom Jumps From Physics Question

Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a phototsensitive material. he stopping potential is measured to be 3.57 V. The threshold frequency of the materials is:

Options

(a) 4 x 10¹⁵ Hz
(b) 5 x 10¹⁵ Hz
(c) 1.6 x 10¹⁵ Hz
(d) 2.5 x 10¹⁵ Hz

Correct Answer:

1.6 x 10¹⁵ Hz

Explanation:

n → 2 – 1 E = 10.2 eV kE = E – ?
Q = 10.20 – 3.57 h u₀ = 6.63 eV
u₀ = 6.63 x 1.6 x 10⁻¹⁹ / 6.67 x 10⁻³⁴
= 1.6 x 10¹⁵ Hz

AddThis Website Tools
admin:

Related Questions

  1. The moment of inertia of a thin uniform rod of mass M and length L about an axis
  2. Moment of inertia of a uniform circular disc about a diameter is I. Its moment
  3. A ship A is moving westwards with a speed of 10 km/h and a ship B 100 km
  4. A particle of mass 100 g is thrown vertically upwards with a speed of 5 m/s. The work
  5. Unit of reduction factor is