1
WB JEE 2008
+1
-0.25

Which of the following statements is correct?

A
The rest mass of a stable nucleus is less than the sum of the rest masses of its separated nucleons.
B
The rest mass of a stable nucleus is greater than the sum of the rest masses of its separated nucleons.
C
In nuclear fission, energy is released by fusion is two nuclei of medium mass (approximately 100 amu)
D
In nuclear fission, energy is released by fragmentation of a very low nucleus.
2
WB JEE 2023
+1
-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,

A
3.4 eV
B
6.8 eV
C
0
D
$$\infty$$
3
WB JEE 2022
+1
-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

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
+1
-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)

A
153 nm
B
409 nm
C
121 nm
D
487 nm
WB JEE Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
Mathematics
Algebra
Trigonometry
Coordinate Geometry
Calculus
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