Advertisements
Advertisements
Question
If a light of wavelength 330 nm is incident on a metal with work function 3.55 eV, the electrons are emitted. Then the wavelength of the wave associated with the emitted electron is (Take h = 6.6 × 10–34 Js)
Options
< 2.75 × 10–9 m
≥ 2.75 × 10–9 m
≤ 2.75 × 10–12 m
< 2.5 × 10–10 m
Advertisements
Solution
< 2.75 × 10–9 m
APPEARS IN
RELATED QUESTIONS
How does one explain the emission of electrons from a photosensitive surface with the help of Einstein's photoelectric equation?
How will the thermionic current vary if the filament current is increased?
The cathode of a diode valve is replaced by another cathode of double the surface area. Keeping the voltage and temperature conditions the same, will the place current decrease, increase or remain the same?
Let i0 be the thermionic current from a metal surface when the absolute temperature of the surface is T0. The temperature is slowly increased and the thermionic current is measured as a function of temperature. Which of the following plots may represent the variation in (i/i0) against (T/T0)?

The work function of aluminum is 4⋅2 eV. If two photons each of energy 2⋅5 eV are incident on its surface, will the emission of electrons take place? Justify your answer.
Emission of electrons by the absorption of heat energy is called ____________ emission.
Define the work function of a metal. Give its unit.
Give an example each of a metal from which photoelectric emission takes place when irradiated by
- UV light
- visible light.
Name the factors on which photoelectric emission from a surface depends.
The work function of a metal is 2.31 eV. Photoelectric emission occurs when the light of frequency 6.4 × 1014 Hz is incident on the metal surface. Calculate
- the energy of the incident radiation,
- the maximum kinetic energy of the emitted electron and
- the stopping potential of the surface.
