In the old days, televisions were made from Cathode Ray Tubeswhereby a...

In the â€œold daysâ€, televisions were made from Cathode Ray Tubes whereby a beam of electrons rapidly...

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Physics

In the â€œold daysâ€, televisions were made from Cathode Ray Tubeswhereby a beam of
electrons rapidly swept across the inside of the screen as a resultof strategic deflections
from magnetic fields acting on the beam. Suppose that Frank has amassive 2000 inch
TV in which the image has to be updated 100 times per second (tominimize the
appearance of â€œflickerâ€) and that there are 100,000 rows.
(a) Show that the electron beam moves across the screen with aspeed v ï€¾ c .
(b) Explain why this superluminal speed does not contradictrelativity. In particular, why
canâ€™t information be transmitted from one side of the screen to theother with v ï€¾ c ?

Answer & Explanation Solved by verified expert

3.8 Ratings (392 Votes)

Realistically the TV would be kind of uselessLet us assumethat the electrons are travelling at the speed of light When theyhit the phosphor screen theyll be imparting energy to the valenceelectrons which will subsequently move to a higher energy stateThey come down to a lower energy See Answer

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In the â€œold daysâ€, televisions were made from Cathode Ray Tubes whereby a beam of electrons rapidly...