JEE Main 27 July 2021 Shift 2 Solved Paper

(A) True, atom of each element emits characteristic spectrum.
(B) True, according to Bohr's postulates mvr=

nh

2π

and hence electron resides into orbits of specific radius called stationary orbits.
(C) False, density of nucleus is constant
(D) False, A free neutron is unstable decays into proton and electron and antineutrino.
(E) True unstable nucleus show radioactivity.