# Questions with detailed step by step solutions from Optics

##### Questions in Optics
1. That the photons possess momentum was proved by
2. In vacuum, speed of light depends upon
3. The nature has selected electromagnetic waves of wavelength between 400 nm to 800 nm for human vision. Which of the following could be the most suitable reason for this selection?
4. A star appears yellow. If it starts accelerating towards the earth, how will its colour appear to change ?
5. Which of the following generates a plane wave front?
6. We may state that the energy $(E)$ of a proton of frequency $v$ is $E=hv$, where $h$ is Planck's constant. The momentum $p$of a photon is $p=\frac{h}{\lambda }$, where $\lambda$ is the wave length of the photon. From the above statement one may conclude that the wave velocity of light is equal to
7. Given Planck's constant$h=6.6\times {{10}^{-34}}\,\text{Js}$. The momentum of each photon in a given radiation is $3.3\times {{10}^{-29}}$ kgm/s. The frequency of radiation is
8. Which of the following is not property of the photons?
9. What is the momentum of a photon having frequency $1.5\times {{10}^{13}}\,\text{Hz}$?
10. The wavelength of a 1 keV photon is $1.24\times {{10}^{-9}}$. What is the frequency of 1MeV photon?