WB JEE 2008 | Atoms and Nuclei Question 1 | Physics

WB JEE 2008

MCQ (Single Correct Answer)

-0.25

The ionisation potential of hydrogen atom is $$-$$13.6 eV. An electron in the ground state of a hydrogen atom absorbs a photon of energy 12.75 eV. How many different spectral lines can one expect when the electron make a downward transition?

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

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

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

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

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

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