1
NEET 2023 Manipur
MCQ (Single Correct Answer)
+4
-1
Change Language

The ground state energy of hydrogen atom is $$-13.6 ~\mathrm{eV}$$. The energy needed to ionize hydrogen atom from its second excited state will be :

A
$$13.6 ~\mathrm{eV}$$
B
$$6.8 ~\mathrm{eV}$$
C
$$1.51 ~\mathrm{eV}$$
D
$$3.4 ~\mathrm{eV}$$
2
NEET 2023 Manipur
MCQ (Single Correct Answer)
+4
-1
Change Language

The wavelength of Lyman series of hydrogen atom appears in:

A
visible region
B
far infrared region
C
ultraviolet region
D
infrared region
3
NEET 2023 Manipur
MCQ (Single Correct Answer)
+4
-1
Change Language

The angular momentum of an electron moving in an orbit of hydrogen atom is $$\mathrm{1.5\left(\frac{h}{\pi}\right)}$$. The energy in the same orbit is nearly.

A
$$-1.5$$ eV
B
$$-1.6$$ eV
C
$$-1.3$$ eV
D
$$-1.4$$ eV
4
NEET 2023
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

The half life of a radioactive substance is 20 minutes. In how much time, the activity of substance drops to $$\left(\frac{1}{16}\right)^{\text {th }}$$ of its initial value?

A
40 minutes
B
60 minutes
C
80 minutes
D
20 minutes
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