The energy of a photon is E = hv and the momentum of photon $\mathrm{p}=\frac{\mathrm{h}}{\mathrm{\lambda }}$, then the velocity of photon will be

(1) E/p                     

(2) Ep

(3)  ${\left(\frac{\mathrm{E}}{\mathrm{P}}\right)}^2$                 

(4) $3\times {10}^8 \mathrm{m}/\mathrm{s}$

The approximate wavelength of a photon of energy 2.48 eV is 
(1) 500 Å                   

(2) 5000 Å

(3) 2000 Å                   

(4) 1000 Å

What is the momentum of a photon in an X-ray beam of 10^-10 meter wavelength?

The energy of a quanta of frequency ${10}^{15}$ Hz and $\mathrm{h}=6.6\times {10}^{-34}\mathrm{ J}-\sec$ will be:

1. $6.6\times {10}^{-19}$ $\mathrm{J}$

$\mathrm{}$2.$6.6\times {10}^{-12}$ $\mathrm{J}$

3. $6.6\times {10}^{-49}$ $\mathrm{J}$

$\mathrm{}$4.$6.6\times {10}^{-41}$ $\mathrm{J}$

Wavelength of a 1 keV photon is $1.24\times {10}^{-9}m$. What is the frequency of 1 MeV photon?

1. $1.24\times {10}^{15} \mathrm{Hz}$      
2.  $2.4\times {10}^{20} \mathrm{Hz}$
3. $1.24\times {10}^{18} \mathrm{Hz}$      
4. $2.4\times {10}^{23} \mathrm{Hz}$

What is the momentum of a photon having frequency $1.5\times {10}^{13} \mathrm{Hz}$?
(a) $3.3\times {10}^{-29} \mathrm{kg} \mathrm{m}/\mathrm{s}$                (b) $3.3\times {10}^{-34} \mathrm{kg} \mathrm{m}/\mathrm{s}$
(c) $6.6\times {10}^{-34} \mathrm{kg} \mathrm{m}/\mathrm{s}$                (d) $6.6\times {10}^{-30} \mathrm{kg} \mathrm{m}/\mathrm{s}$

The energy of a photon of light of wavelength 450 nm is

(1) $4.4\times {10}^{-19} \mathrm{J}$             

(2) $2.5\times {10}^{-19} \mathrm{J}$

(3) $1.25\times {10}^{-17} \mathrm{J}$            

(4) $2.5\times {10}^{-17} \mathrm{J}$

Which of the following is true for photon 
(1) $\mathrm{E}=\frac{\mathrm{hc}}{\mathrm{\lambda }}$         

(2) $\mathrm{E}=\frac{1}{2}{\mathrm{mu}}^2$

(3) $\mathrm{p}=\frac{\mathrm{E}}{2\mathrm{v}}$         

(4) $\mathrm{E}=\frac{1}{2}{\mathrm{mc}}^2$

Einstein's photoelectric equation states that \(E_k=h \nu -\phi.\)${\mathrm{}}_{}$ In this equation \(E_k\) refers to:

Kinetic energy with which the electrons are emitted from the metal surface due to photoelectric effect is 

(1) Independent of the intensity of illumination

(2) Independent of the frequency of light

(3) Inversely proportional to the intensity of illumination

(4) Directly proportional to the intensity of illumination