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Atoms Molecules And Nuclei QUESTIONS AND ANSWERS

IIT JEE : Atoms Molecules And Nuclei QUESTIONS AND ANSWERS :: part1 : 26 to 30

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

26.Electron in a hydrogen atom makes a transition from an excited state to the ground state, which of the following statement is true ?

Its kinetic energy increases, potential energy decreases and total energy also decreases

Its kinetic energy decreases, potential energy decreases and total energy also increases

Its kinetic energy decreases and total energy increases.

Its kinetic energy, potential energy and total energy, all increases.

27.Transitions from the state n = 4 to n = 3 in a hydrogen like atom results in ultraviolet radiations. Infrared radiations will be obtained in the transition

5 to 4

4 to 2

3 to 2

2 to 1

28.Half life of a radioactive substance is 10 second. Then undecayed nuclei of the substance will reduce to 6.25% of their value at t = 0 in a time of

30 sec

40 sec

50 sec

60 sec

29.Amount of original radioactive atom left after 5 half lives will be

20%

10%