BITSAT 2024 | Atoms and Nuclei Question 1 | Physics

Which of the following transitions of $ \mathrm{He}^{+} $ion will give rise to spectral line which has same wavelength as the spectral line in hydrogen atom?

$ n=4 $ to $ n=2 $

$ n=6 $ to $ n=5 $

$ n=6 $ to $ n=3 $

None of these

BITSAT 2023

MCQ (Single Correct Answer)

-1

The total energy of an electron in the second excited state of hydrogen atom is about $$-1.51 \mathrm{~eV}$$. Its kinetic energy in this state is

$$-1.5 \mathrm{~eV}$$

$$-3.02 \mathrm{~eV}$$

3.02 eV

1.51 eV

BITSAT 2023

MCQ (Single Correct Answer)

-1

After two hours one-eight of the starting amount of a certain radioactive isotope remained undecayed. The half-life of the isotope is

15 min

40 min

45 min

4 h

BITSAT 2022

MCQ (Single Correct Answer)

-1

In a radioactive material the activity at time t₁, is A₁ and at a later time t₂, it is A₂. If the decay constant of the material is $$\lambda$$, then

$${A_1} = {A_2}\,{e^{ - \lambda ({t_1} - {t_2})}}$$

$${A_1} = {A_2}\,{e^{\lambda ({t_1} - {t_2})}}$$

$${A_1} = {A_2}({t_2}/{t_1})$$

$${A_1} = {A_2}$$

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