a) You are standing at Sydney Spaceport observing a spaceship travelling towards

Question

a) You are standing at Sydney Spaceport observing a spaceship travelling towards you

at 0.95 times the speed of light.

The captain of the spaceship, who is stationed midway between the front and rear of the ship, sends out radio signals to turn on light beacons located at the front and rear of the ship. He observes both beacons to be turned on simultaneously.

Without performing any calculations, describe and explain in your own words what is observed by you on the ground in Sydney. Use diagrams to illustrate your answer.

b) The work function of sodium metal is 1.82 eV. What is the maximum kinetic energy (Kmax) that photo-emitted electrons from sodium metal can have when it is illuminated with 350 nm light?

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Explanation / Answer

a)the signal reaches the rear and quicker than the front end. the light getting turned on in the rear and takes longer to reach the middle as compared to that in the front end. these two factors compensate each other. hence, it seems they both get turned on simultaneously

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