$O_2$ molecule consists of two oxygen atoms. In the molecule, nuclear force between the nuclei of the two atoms

$M_x$ and $M_y$ denote the atomic masses of the parent and the daughter nuclei respectively in radioactive decay. The $Q$ -value for a $\beta$ - decay is $Q_1$ and that for a ${\beta }^{+}$ decay is $Q_2$. If $m_e$ denotes the mass of an electron, then which of the following statements is correct?

Assertion: By increasing the accelerating voltage in Coolidge tube wavelength of characteristic $X$-rays does not change.

Reason: Cut-off wavelength is inversely proportional to the acceleration voltage.

Assertion: If distance of the point source is increased from the photoelectric plate, then stopping potential will remain unchanged.

Reason: Saturation current will decrease.

Assertion- The red light is just able to emit photoelectrons from a metal surface, then violet light cannot emit the photoelectrons from that metal.

Reason- The energy of violet light photons is more than red light photons.