BITSAT 2021 | Atoms and Nuclei Question 7 | Physics

A radioactive sample at any instant has its disintegration rate 5000 disintegrations per min. After 5 min, the rate is 1250 disintegrations per min. Then, the disintegration constant (per min) is

0.4 log_e 2

0.2 log_e 2

0.1 log_e 2

0.8 log_e 2

BITSAT 2020

MCQ (Single Correct Answer)

-1

Identify the hydrogen-like element whose spectral lines are four times shorter in wavelength compared to those of atomic hydrogen.

Lithium

Helium

Berilliyum

Potassium

BITSAT 2020

MCQ (Single Correct Answer)

-1

The decay constants of two radioactive substances X and Y are 4$$\lambda$$ and $$\lambda$$ respectively. At t = 0, a sample has the same number of two nuclei. The time taken for the ratio of number of nuclei to become $${1 \over {{e^3}}}$$ will be

$${1 \over {3\lambda }}$$

$${1 \over {2\lambda }}$$

$${2 \over {3\lambda }}$$

$${3 \over {2\lambda }}$$

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