Q1- How much time is required for a radio signal to travel from Earth to a space station on Mars if the planet Mars is 7.83 x 10⁷ km from Earth?  

Q2- The speed of light through a transparent substance is 2.00 x 10⁸ m/s. What is the index of refraction of the substance?

Q3- A monochromatic light source used in a diffraction experiment has a wavelength of 4.60 x 10^-7 m. What is the energy of a photon of this light?

Q4- The wavelength of light from a monochromatic source is measured to be 6.80 x 10^-7 m.

(a) What is the frequency of this light?

(b) What energy does each photon have?

Solution: