Consider the following statements :

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Question

$(A)$ True, atom of each element emits characteristic spectrum.

$(B)$ True, according to Bohr's postulates $m v r=\frac{n h}{2 \pi}$ and hence

Vedclass · Accepted Answer

$A,B$ and $E$ only

Vedclass · Answer

$(A)$ True, atom of each element emits characteristic spectrum.

$(B)$ True, according to Bohr's postulates $m v r=\frac{n h}{2 \pi}$ 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 uncleus show radioactivity.

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