Taking 1 ly (light year) = `9.3 xx 10^(15)m` and one day = 86400 s, express the speed of light `(= 3`xx` 10^(8)ms^(-1)` as ly `(day)^(-1)`

The speed of light in vacuum is 3 xx 10^8 ms^(-1)

Express the speed of light in meter per pico second (c=3xx10^(8)ms^(-1)) .

The wavelength of red light is 800 nm. Find its frequency. Speed of light = 3 xx 10^(8) m s^(-1).

The speed of light in. water is 2.25 xx 10^(8) ms^(-1) . If the speed of light in vacuum is 3 xx 10^(8) ms^(-1) , calculate the refractive index of water.

The distance of a galaxy from the earth is 5.6 xx 10^(25) m. Assuming the speed of light to be 3 xx 10^8 m s^(-1) find the time taken by light to travel this distance.

Wavelength of ultraviolet light is 3 xx 10^(-5) cm . What will be the energy of a photon of this light, in eV? (c = 3 xx 10^(10) m.s^(-1))

Calculate the frequency of yellow light of wavelength 550 nm. The speed of light is 3 xx 10^(8) ms^(-1) .

Calculate the energy in MeV equivalent to the rest mass of an electron . Given that the rest mass of an electron , m=9.1 xx 10^(-31) kg , 1MeV = 1.6 xx 10^(-13) J and speed of light , c= 3 xx 10 ^(8) ms ^(-1) .