6 Question-answer velocity of light
1. Velocity of electromagnetic waves in a medium depends upon
(a) Thermal properties of medium
(b) Mechanical and electrical properties of medium
(c) Electrical and magnetic properties of medium
(d) Mechanical and magnetic properties of medium
Ans: (c)
2. This of the following statement is wrong.
(a) Light travels faster in vacuum than air
(b) The wavelength of light is longer than the wavelength of sound
(c) Sound travels nearly 330 metres in one second
(d) Speed of sound is much less than speed of light
Ans: (b)
3. The first successful astronomical determination of the speed of light was made by
(a) Newton
(b) Roemer
(c) Galileo
(d) Fizeau.
Ans: (b)
4. The first laboratory determination of the speed of light was made by
(a) Fizeau
(b) Foucault
(c) Roemer
(d) Michelson.
Ans: (b)
5. Velocity of electromagnetic waves in vaccum depends upon
(a) Frequency of waves
(b) Amplitude of waves
(c) Velocity of source
(d) None of above
Ans: (d)
6. In Michelson’s experiment, distance between twofixed mirrors is increased to twice. How will the speed of octagonal mirror be adjusted for continuous image of the source?
(a) Twice
(b) Half
(c) Same
(d) Four times.
Ans: (b)