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Class XII Physics Atomic Nucleus 6

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Question 1

Heavy water is used as moderator in a nuclear reactor. The function of the moderator is -

Question 2

A potential difference of 20 kV is applied across an X-ray tube. The maximum wavelength of X-rays generated is–

Question 3

The effective charge experienced by an M( n = 3) electron in an atom of atomic number z is about (z - 7.4) e. The frequency of L_a X-rays of such an element is

Question 4

Proton and α-particles have the same de-Broglie wavelength. What is the same for both of them -

Question 5

A proton accelerated through a potential difference of 100V, has de-Broglie wavelength λ₀. The de-Broglie wavelength of an α-particle, accelerated through 800V is-

Question 6

The magnetic field at the centre of a hydrogen atom due to the motion of the electron in the first Bohr orbit is B. The magnetic field at the centre due to the motion of the electron in the second Bohr orbit will be -

Question 7

90% of the active nuclei present in a radioactive sample are found to remain undecayed after 1 day. The percentage of undecayed nuclei left after two days will be

Question 8

The half-value period of a radioactive element is 20 seconds. At any instant the number of radioactive nuclei is one million. Ten seconds later, the number of radioactive nuclei left are -

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Dec 31JEE & BITSAT