NEET Questions

The spectrum produced from an element is:

Which of the following expressions represents the spectrum of Balmer series (If n is the principal quantum number of higher energy level) in Hydrogen atom?

The H-spectrum show:

In photoelectric effect, the kinetic energy of photoelectrons increases linearly with the

Slope of ${\mathrm{V}}_0$ vs v curve is (where ${\mathrm{V}}_0$=stopping potential, v=subjected frequency)

The photoelectric emission from a surface starts only when the light incident upon the surface has certain minimum:

If ${\mathrm{\lambda }}_0$ and $\mathrm{\lambda }$ be the threshold wavelength and the wavelength of incident light, the velocity of photo-electrons ejected from the metal surface is:

The ratio of slopes of ${\mathrm{K}}_{\max } \mathrm{vs}. \mathrm{v} \mathrm{and} {\mathrm{V}}_0 \mathrm{vs}. \mathrm{v}$ curves in the photoelectric effect gives (v=frequency, ${\mathrm{K}}_{\max }$=maximum kinetic energy, ${\mathrm{V}}_0$ stopping potential):

Which of the following has the largest de Broglie wavelength (all have equal velocity)

An excited state of H atom emits a photon of wavelength $\mathrm{\lambda }$ and returns in the ground state, the principal quantum number of excited state is given by:

A dye absorbs a photon of wavelength $\mathrm{\lambda }$ and re-emits the same energy into two photons of wavelengths ${\mathrm{\lambda }}_1$ and ${\mathrm{\lambda }}_2$ respectively. The wavelength $\mathrm{\lambda }$ is related with ${\mathrm{\lambda }}_1$ and ${\mathrm{\lambda }}_2$ as:

the tenth element in the periodic table resembles:

Which of the following order is not in accordance with the property stated against it ?

An element X occurs in short period having configuration ns²np¹ . The formula and nature of its oxide are:

The outermost electronic configuration of the most electronegative element is :