1
MHT CET 2022 11th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

The wave number of the last line of the Balmer series in hydrogen spectrum will be

(Rydberg's constant $$=10^7 \mathrm{~m}^{-1}$$ )

A
$$250 \mathrm{~m}^{-1}$$
B
$$2.5 \times 10^6 \mathrm{~m}^{-1}$$
C
$$0.25 \times 10^9 \mathrm{~m}^{-1}$$
D
$$2.5 \times 10^5 \mathrm{~m}^{-1}$$
2
MHT CET 2021 24th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

The half life of a radioactive substance is 30 minute. The time taken between 40% decay and 85% decay of the same radioactive substance is

A
15 minute
B
90 minute
C
60 minute
D
30 minute
3
MHT CET 2021 24th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

The ratio of energies of photons produced due to transition of electron of hydrogen atom from its (i) second to first energy level and (ii) highest energy level to second energy level is

A
$$6:1$$
B
$$3: 1$$
C
$$12: 1$$
D
$$8: 1$$
4
MHT CET 2021 24th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

An electron makes a transition from an excited state to the ground state of a hydrogen like atom. Out of the following statements which one is correct?

A
Kinetic energy, potential energy and total energy decreases
B
Kinetic energy and total energy decreased but potential energy increases
C
Kinetic energy increases but potential energy and total energy decreases
D
Kinetic energy decreases, potential energy increases but total energy remains the same.
MHT CET Subjects
EXAM MAP
Medical
NEET
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
Defence
NDA
CBSE
Class 12