A photon released by the transition of an electron from the second excited state to the ground state of Hydrogen atom is incident on the surface of a metal of work function 3.1 eV . The de-Broglie wavelength of the most energetic electron emitted from that metal surface is nearly
The radius of a nucleus of mass number 27 is $R$. Which of the following is true about a nucleus whose radius is $2 R$ ?
The nucleus ${ }_{50}^{120} X$ undergoes the series of reactions given below:
$$ { }_Z^A X \xrightarrow{\alpha \text {-decay }} P \xrightarrow{\beta^{-} \text {-decay }} Q \xrightarrow{\alpha \text {-decay }} R $$
The number of neutrons in the nucleus $R$ is
In the logic circuit given below, if $X=1$ and $Y=1$, then the values of $P, Q$ and $R$ are
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