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ICSE Class 10 Answered

Why is rate of thermionic emission less in an evacuated bulb as compared to one which is filled with inert gas at low pressure?
Asked by Topperlearning User | 21 May, 2014, 01:20: PM
answered-by-expert Expert Answer

The reason for the above fact is that " Vacuum is the poorest conductor of electricity".  Due to this few electrons can migrate from cathode to anode.  But, if the bulb is filled with inert gas at low pressure, then rate of thermionic emission increases.

Answered by | 21 May, 2014, 03:20: PM
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