#13 Relativity

Part 1: Time

Q1: The light traveling on the moving clock passes longer distance than the stationary clock.

Q2: The time required for the moving clock traveling back and forth is longer than the stationary clock.

Q3: On the moving clock, the distance and time is the same as the stationary.

Q4: If the velocity of the moving clock decrease, the difference in time also decreases.

Q5: t = 1.2x(2000/(3x10^8)) = 8x10^(-6), the simulation caters to the calculations.

Q6: 3 x 10^8 x 7.45 x 10^(-6) / 2000 = 1.12

Part 2: Length

Q1: Measuring in the frame, the time is the same for moving and stationary.

Q2: The time measured on earth is longer than the measurement in the light clock.

Q3: They will not be equal.

Q4:  1000 / 1.3 =769 m

#15 Laser

Q1: 3+183+20=206 for this specific moment. Other moments also shows conservation.

Q2: There is no preferred direction for which the photon goes.

Q3:  Although most of them emitted at the beginning, there can be a few atoms remaining in its exited states for a long time,so the time is not constant.

Q4: When the photon interact with the excited atom, the atom emits another photon that is in the same direction and same phase as the incoming photon.

Q5: 70 might be a good guess because it varies from 8:12 to 12:8 nearly all the time.

Q6: The odd direction photons are in spontaneous emission originally, but these photons sometimes interact with another exited photon thus causing a stimulated emission of photons.