Q#1
The speed of light is 299,792,458 m/s(a) with respect to the earth
(b) with respect to Sun
(c) with respect to a train moving on the earth
(d) with respect to a spaceship going in outer space.
Answer: (a),(b),(c),(d).
The speed of light in a vacuum is a universal constant. It does not depend on the speed of other things, not even on the speed of the source from which it is emitted. Hence all options are true.
Q#2
Which of the following methods can be used to measure the speed of light in a laboratory?
(a) Roemer method.
(b) Fizeau method.
(c) Foucault method.
(d) Michelson method.
Answer: (c)
Only the Foucault method can be used to measure the speed of light in the laboratory. Other methods need a large distance outside due to the high speed of the light. Hence the option (c).
Q#3
Which of the following methods can be used to measure the speed of light in water?
(a) Roemer method.
(b) Fizeau method.
(c) Foucault method.
(d) Michelson method.
Answer: (c)
Since only the Foucalt method can be used in the laboratory, it can easily be used to measure the speed of light in water by keeping the medium between the two mirrors as water. Other methods are not suitable because these are performed in open fields. Hence the option (c).
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