1
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
$$\infty$$
2
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
$${\varepsilon _1} > {\varepsilon _2} > {\varepsilon _3}$$
3
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
4
WB JEE 2021
MCQ (Single Correct Answer)
+1
-0.25
Change Language
A 12.5 eV electron beam is used to bombard gaseous hydrogen at ground state. The energy level upto which the hydrogen atoms would be excited is
A
2
B
3
C
4
D
1
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