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Chapter 2: 16CQ (page 62)

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?

Short Answer

Expert verified

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.

Step by step solution

01

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.

02

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.

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Most popular questions from this chapter

The diagram shows Bob's view of the passing of two identical spaceship. Anna's and his own, where γv=2. The length of either spaceship in its rest frame is . What are the readings on Anna', two unlabelled clocks?

A particle of mass m。moves through the lab at 0.6c. Suddenly it explodes into two fragments. Fragment 1 , mass 0.66m0, moves at 0.8cin the same direction the original particle had been moving. Determine the velocity (magnitude and direction) and mass of fragment2.

A light beam moves at an angleθ with the x-axis as seen from frame S. Using the relativistic velocity transformation, find the components of its velocity when viewed from frame S'. From these, verify explicitly that its speed is c.

You stand at the center of your 100 m spaceship and watch Anna's identical ship pass at 0.6c. At t=0 on your wristwatch, Anna, at the center of her ship, is directly across you and her wristwatch also reads 0.

(a) A friend on your ship,24 m from you in a direction towards the tail of the ship, looks at a clock directly across from him on Anna's ship. What does it read?

(b) Your friend now steps onto Anna's ship. By this very act he moves from a frame where Anna is one age to a frame where she is another. What is the difference in these ages? Explain.

(c) Answer parts (a) and (b) for a friend 24 m from you but in a direction toward the front of Anna's passing ship.

(d) What happens to the reading on a clock when you accelerate toward it? Away from it?

Question: Two objects isolated from the rest of the universe collide and stick together. Does the system’s final kinetic energy depend on the frame of reference in which it is viewed? Does the system’s change in kinetic energy depend on the frame in which it is viewed? Explain your answer.
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