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Modern Physics
Found in: Page 62
Modern Physics

Modern Physics

Book edition 2nd Edition
Author(s) Randy Harris
Pages 633 pages
ISBN 9780805303087

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Short Answer

In a television picture tube, a beam of electrons is sent from the back to the front (screen) by an electron gun. When an electron strikes the screen, il causes a phosphor to glow briefly. To produce an image across the entire screen. the beam is electrically deflected up and down and left and right. The beam may sweep from left to right at a speed greater than c. Why is this not a violation of the claim that no information may travel faster than the speed of light?

As light contains massless particles like photons, that is one of the main reasons no other information may travel faster than the speed of light.

See the step by step solution

Step by Step Solution

TABLE OF CONTENTS :
TABLE OF CONTENTS

Step 1: Significance of the speed of light

The speed of light is described as the number the light travels in one second. The light travels about 299792458 meters per second.

Step 2: Determination of the violation of the claim

If there are two events such as hitting a screen at different positions which usually does not have any kind of effects. Apart from that, while the transition, no other information has been transferred as a beam do not have a physical identity. Hence, exceeding the light’s speed is not a special relativity’s violation.

Thus, as light contains massless particles like photons, that is one of the main reasons no other information may travel faster than the speed of light.

Most popular questions for Physics Textbooks

A particle of mass m。 moves through the lab at 0.6 c. Suddenly it explodes into two fragments. Fragment 1 , mass 0.66m0, moves at 0.8 c in the same direction the original particle had been moving. Determine the velocity (magnitude and direction) and mass of fragment 2 .

At rest, a light source emits 532 nmlight. (a) As it moves along the line connecting it and Earth. observers on Earth see412 nm . What is the source's velocity (magnitude and direction)? (b) Were it to move in the opposite direction at the same speed. what wavelength would be seen? (c) Were it to circle Earth at the same speed. what wavelength would be seen?

Question: A light beam moves in the xy plane and has an x component of velocity of ux (a) In terms of ux, and c, what is its y component? (b) Using equations (2-20a) and (2-20b). Calculate its velocity components in a frame moving in the x direction at speed v=ux and comment on your result.

From the Lorentz transformation equations, show that if time intervals between two events,∆t and∆t' , in two frames are of opposite sign, then the events are too far apart in either frame for light to travel from one to the other. Argue that therefore they cannot be casually related.

An object of mass 3mo moves to the right at 0.8 c.

a) Calculate its momentum and energy.

b) Using the relativistic velocity transformation, determine its velocity in a new frame of reference moving it to right at 0.5 c, then using it to determine the object's momentum and energy in this new frame.

c) Verify that equations role="math" localid="1657556434416" (2-38) are satisfied.
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