NEET 2019 | Atoms and Nuclei Question 30 | Physics

NEET 2019

MCQ (Single Correct Answer)

-1

The total energy of an electron in an atom in an orbit is –3.4 eV. Its kinetic and potential energies are, respectively.

3.4 eV, – 6.8 eV

3.4 eV, 3.4 eV

– 3.4 eV, – 3.4 eV

– 3.4 eV, – 6.8 eV

NEET 2018

MCQ (Single Correct Answer)

-1

The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom, is

1 : 1

1 : -1

2 : -1

1 : -2

NEET 2018

MCQ (Single Correct Answer)

-1

Out of Syllabus

For a radioactive material, half-life is 10 minutes. If initially there are 600 number of nuclei, the time taken (in minutes) for the disintegration of 450 nuclei is

NEET 2017

MCQ (Single Correct Answer)

-1

Out of Syllabus

Radioactive material 'A' has decay constant '8 $$\lambda $$' and material 'B' has decay constant '$$\lambda $$'. Initially they have same number of nuclei. After what time, the ratio of number of nuclei of material 'B' to that 'A' will be e ?

$${1 \over {7\lambda }}$$

$${1 \over {8\lambda }}$$

$${1 \over {9\lambda }}$$

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

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