WB JEE 2008 | Atoms and Nuclei Question 2 | Physics

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WB JEE 2008

MCQ (Single Correct Answer)

-0.25

Which of the following statements is correct?

The rest mass of a stable nucleus is less than the sum of the rest masses of its separated nucleons.

The rest mass of a stable nucleus is greater than the sum of the rest masses of its separated nucleons.

In nuclear fission, energy is released by fusion is two nuclei of medium mass (approximately 100 amu)

In nuclear fission, energy is released by fragmentation of a very low nucleus.

WB JEE 2023

MCQ (Single Correct Answer)

-0.25

If the potential energy of a hydrogen atom in the first excited state is assumed to be zero, then the total energy of n = $$\infty$$ state is,

3.4 eV

6.8 eV

$$\infty$$

WB JEE 2022

MCQ (Single Correct Answer)

-0.25

If the kinetic energies of an electron, an alpha particle and a proton having same de-Broglie wavelength are $${\varepsilon _1},{\varepsilon _2}$$ and $${\varepsilon _3}$$ respectively, then

$${\varepsilon _1} > {\varepsilon _3} > {\varepsilon _2}$$

$${\varepsilon _1} = {\varepsilon _3} = {\varepsilon _2}$$

$${\varepsilon _1} < {\varepsilon _3} < {\varepsilon _2}$$

$${\varepsilon _1} > {\varepsilon _2} > {\varepsilon _3}$$

WB JEE 2022

MCQ (Single Correct Answer)

-0.25

Suppose in a hypothetical world the angular momentum is quantized to be even integral multiples of $${h \over {2\pi }}$$. The largest possible wavelength emitted by hydrogen atoms in visible range in a world according to Bohr's model will be,

(Consider hc = 1242 Mev-fm)

153 nm

409 nm

121 nm

487 nm

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