JEE Main 2020 (Online) 3rd September Morning Slot | Atoms and Nuclei Question 186 | Physics

In a hydrogen atom the electron makes a transition from (n + 1)^th level to the n^th level. If n >> 1, the frequency of radiation emitted is proportional to :

$${1 \over n}$$

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

$${1 \over {{n^3}}}$$

$${1 \over {{n^4}}}$$

JEE Main 2020 (Online) 2nd September Morning Slot

MCQ (Single Correct Answer)

-1

In a reactor, 2 kg of ₉₂U²³⁵ fuel is fully used up in 30 days. The energy released per fission is 200 MeV. Given that the Avogadro number, N = 6.023 $$ \times $$ 10²⁶ per kilo mole and 1 eV = 1.6 × 10^–19 J. The power output of the reactor is close to

125 MW

60 MW

54 MW

35 MW

JEE Main 2020 (Online) 9th January Evening Slot

MCQ (Single Correct Answer)

-1

The energy required to ionise a hydrogen like ion in its ground state is 9 Rydbergs. What is the wavelength of the radiation emitted when the electron in this ion jumps from the second excited state to the ground state ?

35.8 nm

11.4 nm

8.6 nm

24.2 nm

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