1
WB JEE 2024
MCQ (Single Correct Answer)
+1
-0.25
Change Language

Which of the following statement(s) is/are truc in respect of nuclear binding energy ?

(i) The mass energy of a nucleus is larger than the total mass energy of its individual protons and neutrons.

(ii) If a nucleus could be separated into its nucleons, an energy equal to the binding energy would have to be transferred to the particles during the separating process.

(iii) The binding energy is a measure of how well the nucleons in a nucleus are held together.

(iv) The nuclear fission is somehow related to acquiring higher binding energy.

A
Statements (i), (ii) and (iii) are true
B
Statements (ii), (iii) and (iv) are true
C
Statements (ii) and (iii) are true
D
All the four statements are true
2
WB JEE 2023
MCQ (Single Correct Answer)
+1
-0.25
Change Language

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,

A
3.4 eV
B
6.8 eV
C
0
D
$$\infty$$
3
WB JEE 2022
MCQ (Single Correct Answer)
+1
-0.25
Change Language

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

A
$${\varepsilon _1} > {\varepsilon _3} > {\varepsilon _2}$$
B
$${\varepsilon _1} = {\varepsilon _3} = {\varepsilon _2}$$
C
$${\varepsilon _1} < {\varepsilon _3} < {\varepsilon _2}$$
D
$${\varepsilon _1} > {\varepsilon _2} > {\varepsilon _3}$$
4
WB JEE 2022
MCQ (Single Correct Answer)
+1
-0.25
Change Language

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)

A
153 nm
B
409 nm
C
121 nm
D
487 nm
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