If $(2, -1, 3)$ is the foot of the perpendicular drawn from the origin to a plane, then the equation of that plane is

$A$ black body at a temperature of $1640\,K$ has the wavelength corresponding to maximum emission equal to $1.75\,\mu m$. Assuming the moon to be a perfectly black body,the temperature of the moon,if the wavelength corresponding to maximum emission is $14.35\,\mu m$,is.......$K$.

Which one of the following is resistant to enzyme action?

In which of the following reactions does $H_2O_2$ act as a reducing agent?

The operation of a nuclear reactor is said to be critical when the value of the neutron multiplication factor $K$ is: