हिंदी
कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान कक्षा ११

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

Advertisements
Advertisements

प्रश्न

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

टिप्पणी लिखिए
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
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 41: Electric Current through Gases - Short Answers [पृष्ठ ३५१]

APPEARS IN

एचसी वर्मा Concepts of Physics Volume 1 and 2 [English]
अध्याय 41 Electric Current through Gases
Short Answers | Q 3 | पृष्ठ ३५१

संबंधित प्रश्न

Find the maximum frequency of X-rays produced by 30 kV electrons.


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


The work function of caesium metal is 2.14 eV. When light of frequency 6 × 1014 Hz is incident on the metal surface, photoemission of electrons occurs. What is the

  1. maximum kinetic energy of the emitted electrons,
  2. Stopping potential, and
  3. maximum speed of the emitted photoelectrons?

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?


A diode value is connected to a battery and a load resistance. The filament is heated, so that a constant current is obtained in the circuit. As the cathode continuously emits electrons, does it become more and more positively charged?


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?


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.


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


Photoelectric emission is observed from a metallic surface for frequencies ν1 and ν2 of the incident light (ν1 > ν2). If the maximum value of kinetic energy of the photoelectrons emitted in the two cases are in the ration 1 : n then the threshold frequency of the metallic surface is ______.


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.

What is responsible for electrical conduction in metals?


What is electron emission?


Which particles at the surface hold free electrons inside the metal?


What must fall on a metal surface for photoelectric emission to occur?


Which is an example associated with photoelectric emission?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×