JEE Main 2020 (Online) 3rd September Evening Slot | Atoms and Nuclei Question 165 | Physics

Hydrogen ion and singly ionized helium atom are accelerated, from rest, through the same potential difference. The ratio of final speeds of hydrogen and helium ions is close to :

2 : 1

1 : 2

5 : 7

10 : 7

JEE Main 2020 (Online) 3rd September Morning Slot

MCQ (Single Correct Answer)

-1

Out of Syllabus

In a radioactive material, fraction of active material remaining after time t is 9/16. The fraction that was remaining after t/2 is

$${3 \over 4}$$

$${4 \over 5}$$

$${3 \over 5}$$

$${7 \over 8}$$

JEE Main 2020 (Online) 2nd September Evening Slot

MCQ (Single Correct Answer)

-1

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

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