JEE Main 2021 (Online) 17th March Evening Shift | Atoms and Nuclei Question 94 | Physics

JEE Main 2021 (Online) 17th March Evening Shift

MCQ (Single Correct Answer)

-1

The atomic hydrogen emits a line spectrum consisting of various series. Which series of hydrogen atomic spectra is lying in the visible region?

Brackett series

Balmer series

Paschen series

Lyman series

JEE Main 2021 (Online) 17th March Morning Shift

MCQ (Single Correct Answer)

-1

If an electron is moving in the n^th orbit of the hydrogen atom, then its velocity (v_n) for the n^th orbit is given as :

$${v_n} \propto {1 \over n}$$

v_n $$ \propto $$ n²

v_n $$ \propto $$ n

$${v_n} \propto {1 \over {{n^2}}}$$

JEE Main 2021 (Online) 17th March Morning Shift

MCQ (Single Correct Answer)

-1

Which level of the single ionized carbon has the same energy as the ground state energy of hydrogen atom?

JEE Main 2021 (Online) 17th March Morning Shift

MCQ (Single Correct Answer)

-1

An electron of mass m and a photon have same energy E. The ratio of wavelength of electron to that of photon is : (c being the velocity of light)

$${1 \over c}{\left( {{{2m} \over E}} \right)^{1/2}}$$

$${1 \over c}{\left( {{E \over {2m}}} \right)^{1/2}}$$

$${\left( {{E \over {2m}}} \right)^{1/2}}$$

$$c{(2mE)^{1/2}}$$

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