A lamp of power 942 W radiates energy uniformly in all direction. The wavelength of radiation is 660 nm .The photon flux on a small screen 5.0 m from the lamp in units of photon $/ \mathrm{m}^2 \mathrm{~s} Q$ is
(take Planck's constant, $h=6.6 \times 10^{-34}$ SI unit)
The shortest wavelength in Balmer series of hydrogen atom spectrum is approximately equal to (use $R_H=1.097 \times 10^7 \mathrm{~m}^{-1}$ )
What will be the energy released in joule, in the process of fission by 1 mg of ${ }_{92}^{240} \mathrm{U}$. Assume energy release per fission is 200 MeV .
[use Avogadro's number as $6 \times 10^{23}$ and 1 eV $=1.6 \times 10^{-19} \mathrm{~J}$ ]
The band gap in a semiconductor is 0.6 eV . The maximum wavelength of electromagnetic radiation which can create a hole electron pair in the semiconductor is equal to
[use $h c=1242 \mathrm{eV}-\mathrm{nm}$ ]
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