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JEE 2020 Physics: Atomic Physics Quiz 1 (30.09.2019)

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Question 1

A radioactive element has rate of disintegration I 0,000 disintegrations per minute at a particular instant. After four minutes it becomes 2500 disintegrations per minute. The decay constant per minute is

Question 2

If the electron in hydrogen atom jumps from second Bohr orbit to ground state and difference between energies of the two states is radiated in the tom of photons, if the work function of the material is 4.2 eV then stopping potential is 13.6 [Energy of electron in nth orbit =

]

Question 3

In Bohr's theory of Hydrogen atom, the electron jumps from higher orbit 'n' to lower orbit `p'. The wavelength will be minimum for the transition

Question 4

When an electron in Hydrogen atom revolves in stationary orbit, it

Question 5

How many number of β particles will be emitted if a radioactive element ₉₀X²³⁸ undergoes a reaction with metal Y which results into decay of the radioactive metal now becoming ₈₃X²³⁰?

Question 6

1 curie represents

Question 7

An electron of mass m_e and proton of mass m_p are moving with the same speed. The ratio of their de-Broglie’s wavelengths $Description: E:\KCET-1-Feb\KARNATAKA-CET-2011_files\image223.png$ is

Question 8

Light emitted during the de excitation of electron from n = 3 to n = 2, when incident on a metal photoelectgrons are just emitted from that metal. In which of the following deexcitations photoelectric effect is not possible?

Question 9

The additional energy that should be given to an electron to reduce its de-Broglie wavelength from 1 nm to 0.5 nm is

Question 10

The ionisation energy of an electron in the ground state of helium atom is 24.6eV. The energy requied to remove both the electron is

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Sep 30JEE & BITSAT