English
Tamil Nadu Board of Secondary EducationHSC Science Class 12

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 - Physics

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

MCQ
Advertisements

Solution

< 2.75 × 10–9 m

shaalaa.com
  Is there an error in this question or solution?
Chapter 8: Dual Nature of Radiation and Matter - Evaluation [Page 135]

APPEARS IN

Samacheer Kalvi Physics - Volume 1 and 2 [English] Class 12 TN Board
Chapter 8 Dual Nature of Radiation and Matter
Evaluation | Q I. 5. | Page 135

RELATED QUESTIONS

How does one explain the emission of electrons from a photosensitive surface with the help of Einstein's photoelectric equation?


The work function of the following metals is given : Na 2.75 ev, K = 2.3 eV, Mo = 4.17 eV and Ni = 5.15 eV. Which of these metals will not cause photoelectric emission for radiation of wavelength 3300 Å from a laser source placed 1 m away from these metals? What happens if the laser source is brought nearer and placed 50 cm away?


An isolated metal sphere is heated to a high temperature. Will it become positively charged due to thermionic emission?


The constant A in the Richardson−Dushman equation for tungsten is 60 × 104 A m−2K−2. The work function of tungsten is 4.5 eV. A tungsten cathode with a surface area 2.0 × 10−5 m2 is heated by a 24 W electric heater. In steady state, the heat radiated by the heater and the cathode equals the energy input by the heater and the temperature becomes constant. Assuming that the cathode radiates like a blackbody, calculate the saturation current due to thermions. Take Stefan's Constant = 6 × 10−8 W m−2 K−1. Assume that the thermions take only a small fraction of the heat supplied.


Define the term "Threshold frequency", in the context of photoelectric emission.  


Define the work function of a metal. Give its unit.


What do you mean by electron emission? Explain briefly various methods of electron emission.


A 150 W lamp emits light of the mean wavelength of 5500 Å. If the efficiency is 12%, find out the number of photons emitted by the lamp in one second.


Give an example each of a metal from which photoelectric emission takes place when irradiated by

  1. UV light
  2. visible light.

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

  1. the energy of the incident radiation,
  2. the maximum kinetic energy of the emitted electron and
  3. the stopping potential of the surface.

Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×