मराठी
कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान इयत्ता ११

How Will the Thermionic Current Vary If the Filament Current is Increased? - Physics

Advertisements
Advertisements

प्रश्न

How will the thermionic current vary if the filament current is increased?

टीपा लिहा
Advertisements

उत्तर

If the filament current is increased, it will increase the temperature of the cathode (metal) and the cathode will emit more electrons. This will lead to an increase in the number of thermions emitted per unit time. As a result, the thermionic current will increase.

shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 19: Electric Current through Gases - Short Answers [पृष्ठ ३५१]

APPEARS IN

एचसी वर्मा Concepts of Physics Vol. 2 [English] Class 11 and 12
पाठ 19 Electric Current through Gases
Short Answers | Q 3 | पृष्ठ ३५१

संबंधित प्रश्‍न

Find the (a) maximum frequency and (b) minimum wavelength of X-rays produced by 30 kV electrons.


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


Would you prefer a material with a high melting point or a low melting point to be used as a cathode in a diode?


Would you prefer a material with a high work-function or a low work-function to be used as a cathode in a diode?


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


Why does thermionic emission not take place in non-conductors?


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 anode of a thermionic diode is connected to the negative terminal of a battery and the cathode to its positive terminal.


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


The wavelength λe of an electron and λp of a photon of same energy E are related by ______.


The wave associated with a moving particle of mass 3 × 10–6 g has the same wavelength as an electron moving with a velocity 6 × 106 ms–1. The velocity of the particle is


Emission of electrons by the absorption of heat energy is called ____________ emission.


Why do metals have a large number of free electrons?


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.


Consider Figure for photoemission.

How would you reconcile with momentum conservation? Note light (photons) have momentum in a different direction than the emitted electrons.


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

  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×