Effect on light emission due to zero signal

Q.  If the bombardment of electrons cease i.e. when the signal becomes zero then the light emitted by the screen will
- Published on 10 Nov 15

a. Disappear immediately
b. Persist for some time then it will disappear
c. Will not disappear at all
d. None of these

ANSWER: Persist for some time then it will disappear

Post your comment / Share knowledge


Enter the code shown above:
 
(Note: If you cannot read the numbers in the above image, reload the page to generate a new one.)