The photoelectric effect occurs only when the incident light has more than a certain minimum:

What is the radius of the stationary orbits $(n)$? State the formula.

If the shortest wavelength in the Lyman series of a hydrogen atom is $A$,then the longest wavelength in the Paschen series of $He^{+}$ is:

The kinetic energy of an electron in the second Bohr orbit of a hydrogen atom is equal to $\frac{h^{2}}{xma_{0}^{2}}$. The value of $10x$ is ........ . ($a_{0}$ is radius of Bohr's orbit) (Nearest integer) [Given : $\pi=3.14$]

The ratio of the highest to the lowest wavelength of Lyman series is

Which of the following species has the same radius as that of the hydrogen atom in the $n = 1$ state?