Atomic Energy Levels

Q. A $p$-type semiconductor has acceptor level $57\text{meV}$ above the valence band. Find the maximum wavelength of light which can create a hole.

1. $2.18\times {10}^{-5}\text{m}$
2. $2.18\times {10}^{-3}\text{m}$
3. $4.36\times {10}^{-3}\text{m}$
4. $4.36\times {10}^{-5}\text{m}$

Q. According to Bohr's theory of the hydrogen atom, the total energy of the hydrogen atom with its electron revolving in the $n^{th}$ stationary orbit is proportional to

1. $n$
2. $n^2$
3. $\frac{1}{n}$
   
4. $\frac{1}{n^2}$

Q. Find the maximum wavelength of electromagnetic radiation which can create an electron - hole pair in silicon whose band gap energy is 1.1 $eV$.

1. 560 $nm$
2. 1130 $nm$
3. 1240 $nm$
4. 870 $nm$

Q. According to Bohr's theory of the hydrogen atom, the total energy of the hydrogen atom with its electron revolving in the $n^{th}$ stationary orbit is proportional to

1. $n$
2. $n^2$
3. $\frac{1}{n}$
   
4. $\frac{1}{n^2}$

Q. In a non isolated atom each orbital is splitted into different sub levels.

1. False
2. True