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Atoms Molecules And Nuclei QUESTIONS AND ANSWERS

IIT JEE : Atoms Molecules And Nuclei QUESTIONS AND ANSWERS :: part2 : 1 to 5

Following IIT JEE Entrance Multiple choice objective type questions and answers will help you in Maths, Physics and Chemistry 2024 examinations :

1.An electron having charge e revolves around a nucleus of an element having atomic number Z. If 47.2 eV of energy is needed for exciting the electron from second Bohr s orbit to third Bohr s orbit, then value of Z will be

2.Half life of plutonium is 2400 years. If plutonium is stored for 96000 years, then fraction of the material that is left behind is

1 / 2

1 / 4

1 / 8

1 / 16

3.At a given time there are25% undecayed nuclei in a sample. After 10 second number of undecayed nuclei reduces to 12.5% . Then mean life of the nuclei will be about

10 sec

15 sec

20 sec

22 sec

4.Half life of a material is 1000 years, fraction of the material left after 4000 years will be

1 / 2

1 / 4

1 / 8

1 / 16

5.Binding energy per nucleon of deuteron is

1.37 MeV

1.53 MeV