NEET Physics MCQs

If an electron in a hydrogen atom jumps from the 3rd orbit to the 2nd orbit, it emits a photon of wavelength $\lambda$. When it jumps from the 4th orbit to the 3rd orbit, the corresponding wavelength of the photon will be:

When an ${\rm{\alpha }}$ - particle of mass ‘m’ moving with the velocity ‘v’ bombards on a heavy nucleus of charge ‘Ze’, its distance of closest approach from the nucleus depends on m as:

When an ${\rm{\alpha }}$ - particle of mass ‘m’ moving with the velocity ‘v’ bombards on a heavy nucleus of charge ‘Ze’, its distance of closest approach from the nucleus depends on m as:

Given the value of Rydberg constants is ${\rm{1}}{{\rm{0}}^7}\,{{\rm{m}}^{ - 1}}$, the wave number of the last line of the Balmer series in hydrogen spectrum will be:

Given the value of Rydberg constants is ${\rm{1}}{{\rm{0}}^7}\,{{\rm{m}}^{ - 1}}$, the wave number of the last line of the Balmer series in hydrogen spectrum will be:

A physical quantity of the dimensions of length that can be formed out of $c,\;G{\rm{ \;and \;}}\frac{{{e^2}}}{{4\pi {\varepsilon _0}}}$ is[ is $c$ velocity of light, $G$ is universal constant of gravitation and $e$ is charge]

A physical quantity of the dimensions of length that can be formed out of $c,\;G{\rm{ \;and \;}}\frac{{{e^2}}}{{4\pi {\varepsilon _0}}}$ is[ is $c$ velocity of light, $G$ is universal constant of gravitation and $e$ is charge]

The $x{\rm{ \;and \;}}y$ coordinates of the particle at any time are $x = 5t - 2{t^2}{\rm{ \;and\; }}y = 10t$ respectively, where $x{\rm{ \;and\; }}y$ are in meters and $t$ in seconds. The acceleration of the particle at $t = 2s$ is

The $x{\rm{ \;and \;}}y$ coordinates of the particle at any time are $x = 5t - 2{t^2}{\rm{ \;and\; }}y = 10t$ respectively, where $x{\rm{ \;and\; }}y$ are in meters and $t$ in seconds. The acceleration of the particle at $t = 2s$ is

Preeti reached the metro station and found that the escalator was not working. She walked up the stationary escalator in time ${t_1}.$ On other days, if she remains stationary on the moving escalator, then the escalator takes her up in time ${t_2}.$ The time taken by her to walk up on the moving escalator will be