Person 1 is in a stationary room with a light bulb suspended from the center of

Question

Person 1 is in a stationary room with a light bulb suspended from the center of the room. Person 2 is in a vehicle that is t correctly describes the order in which the two people will observe the lights hitting the sensors A and B on the walls of the room? very fast away from the room as shown below. Which of the following Person 2 Person 1 Both people agree that light hits sensors A and B at the same time Both people agree that light hits sensor A first. Person 1 observes that light hits A and B at the same time, but person 2 observes that light hits A first Person 1 observes that light hits A and B at the same time, but person 2 observes that light hits B first. 19 of 20 A person standing still, relative to a fast moving spaceship, measures the tick of the clock relative to the tick of a clock on the spaceship. When the clock has ticked time t, the person will observe that the clock on the ship will have ticked a time less than t equal to t O greater than t. More information is needed. The speed of the ship needs to be known. 18 of 20 Which of the following experimental results helps prove the wave nature of light (i.e., which results can only be explained through wave behavior)? Rainbow patterns that form when white light passes through a prism. O Interference pattern that forms when light passes through two small slits in a barrier Equal angle reflection of a laser beam forms off a mirrored surface O All of the above statements are true 9 of 20 A wave front can correctly be described as the crest of a transverse wave the region of high pressure in a longitudinal wave a source of spherical wavelets All of the above statements are correct

Explanation / Answer

1.From the point of view of person 2, the light travelling from the center of the room to sensor A has a greater velocity than that travelling from the center to B since the velocity of the room and that of light add in the first case will in the second case they subtract. Therefore person 2 will observe the light to hit A faster than it hits B. It is quite obvious that in his own reference frame person 1 will observe the light to hit A and B at the same time.Therefore option C) is the right option.

2.From the time dilation principle, the time interval between two events measured by the spaceship on the earth is measured to be longer than the time measured by the person in the moving spaceship. Thus it is clear that when the time measured by the stationary person is t, the time he measures on the moving clock will be greater than t.Therefore option C) is the correct one.

3.The first experiment has to do with dispersion of light, the second with interference and the third has to do with reflection. All these three results can be explained or proven by the wave theory of light. Therefore,option D) is the right one.

4.From Huygen's principle, a wavefront can be constructed by considering points on spherical wavelets.It is in fact the envelope to the wavelets at the point of tangency. Therefore option C) is the right option.The other 2 options have no relation to a wavefront.

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