An atom has a single electron. Its ground state energy is -30 eV and its first excited state energy is -8 eV . The atom is bombarded with a stream of photons, each of energy 15 eV .

Assuming the atom being in the ground state, which of the following statements is correct?

A. Atom gets excited to the first excited state and later emit photons of 22 eV

B. Atom absorbs energy continuously until 22 eV is accumulated and then gets excited

C. Atom will not get excited, and the transmitted light will have the same frequency as the incident light

D. Atom will absorb the photon and re-emit a photon of lower energy

A nucleus of uranium -235 absorbs a slow neutron and undergoes nuclear fission according to the reaction: ${ }_{92}^{235} U+{ }_0^1 n \rightarrow{ }_{56}^{141} B a+{ }_{36}^{92} K r+3{ }_0^1 n+Q$

If the average energy released per fission is 202 MeV , the energy released when 2.35 g of $U^{235}$ undergoes complete fission is approximately;

[Given $1 \mathrm{eV}=1.6 \times 10^{-19} \mathrm{~J}$, Avogadro number $=6.02 \times 10^{23}$ ]

A mercury-198 nucleus is bombarded by a neutron, which causes a nuclear reaction

$$ n_0^1+\mathrm{Hg}_{80}^{198} \longrightarrow A u_{79}^{197}+X $$

What is the unknown product particle $X$ ?

Two deuterons are fused to form one alpha particle. If binding energy per nucleon of deuterium is 1.05 MeV and that of alpha particle is 7 MeV , what is the energy released in the formation of one alpha particle from the fusing of two deuterons?