JEE Main 2023 (Online) 29th January Morning Shift | Atoms and Nuclei Question 96 | Physics

If a radioactive element having half-life of $$30 \mathrm{~min}$$ is undergoing beta decay, the fraction of radioactive element remains undecayed after $$90 \mathrm{~min}$$. will be

$$\frac{1}{16}$$

$$\frac{1}{4}$$

$$\frac{1}{8}$$

$$\frac{1}{2}$$

JEE Main 2023 (Online) 25th January Evening Shift

MCQ (Single Correct Answer)

-1

The energy levels of an atom is shown in figure.

JEE Main 2023 (Online) 25th January Evening Shift Physics - Atoms and Nuclei Question 90 English

Which one of these transitions will result in the emission of a photon of wavelength 124.1 nm?

Given (h = 6.62 $$\times$$ 10$$^{-34}$$ Js)

JEE Main 2023 (Online) 25th January Morning Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

The ratio of the density of oxygen nucleus ($$_8^{16}O$$) and helium nucleus ($$_2^{4}\mathrm{He}$$) is

4 : 1

1 : 1

2 : 1

8 : 1

JEE Main 2023 (Online) 24th January Evening Shift

MCQ (Single Correct Answer)

-1

A photon is emitted in transition from n = 4 to n = 1 level in hydrogen atom. The corresponding wavelength for this transition is (given, h = 4 $$\times$$ 10$$^{-15}$$ eVs) :

99.3 nm

94.1 nm

974 nm

941 nm

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