wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

Mention the reason why tungsten is a suitable metal for Thermionic emission


Open in App
Solution

Undesrtanding the thermal chemistry of Tungsten.

  • Tungsten has a high melting point of 3655K with a high work function of about 4.52eV.
  • Tungsten starts electronic emission at 2500K.
  • Thoriated tungsten i.e., Tungsten coated with Carbon and Thorium has a work function of 2.6eV and in Thoriated Tungsten electronic emission begins at 2000K.
  • Infact when Tungsten is coated with Barium and Strontium Oxide, the work function of this material reduces to 1eV and electronic emission begins at 1000K.
  • For these reasons Tungsten is suiatble for thermionic emission.

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Some Functions and Their Graphs
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon