Physics MCQs for NEET — Practice Questions with Answers

For the Bohr's first orbit of circumference $2\mathrm{\pi r}$, the de-Broglie wavelength of revolving electron will be

The energy of a photon of light with wavelength 5000 Å is approximately 2.5 eV. This way the energy of an X-ray photon with wavelength 1Å would be 

If in nature there may not be an element for which the principal quantum number n > 4, then the total possible number of elements will be

In the Bohr's hydrogen atom model, the radius of the stationary orbit is directly proportional to (n = principle quantum number) 

In the nth orbit, the energy of an electron ${\mathrm{E}}_{\mathrm{n}}=-\frac{13.6}{{\mathrm{n}}^2}\mathrm{eV}$ for hydrogen atom. The energy required to take the electron from first orbit to second orbit will be

In the following atoms and moleculates for the transition from n= 2 to n = 1, the spectral line of minimum wavelength will be produced by 

The Lyman series of hydrogen spectrum lies in the region

The size of an atom is of the order of

Which one of the series of hydrogen spectrum is in the visible region 

The Rutherford $\mathrm{\alpha }$-particle experiment shows that most of the $\mathrm{\alpha }$-particles pass through almost unscattered while some are scattered through large angles. What information does it give about the structure of the atom