Electricity
Current Electricity
MCQ (Single Correct Answer)
Moving Charges and Magnetism
MCQ (Single Correct Answer)
Magnetism and Matter
MCQ (Single Correct Answer)
Electromagnetic Induction
MCQ (Single Correct Answer)
Electromagnetic Waves
MCQ (Single Correct Answer)
Modern Physics
Semiconductor Electronics
MCQ (Single Correct Answer)
1
NEET 2023
MCQ (Single Correct Answer)
+4
-1

In hydrogen spectrum, the shortest wavelength in the Balmer series is $$\lambda$$. The shortest wavelength in the Bracket series is :

A
$$4 \lambda$$
B
$$9 \lambda$$
C
$$16 \lambda$$
D
$$2 \lambda$$
2
NEET 2023
MCQ (Single Correct Answer)
+4
-1

The radius of inner most orbit of hydrogen atom is $$5.3 \times 10^{-11} \mathrm{~m}$$. What is the radius of third allowed orbit of hydrogen atom?

A
1.06 $$\mathop A\limits^o $$
B
1.59 $$\mathop A\limits^o $$
C
4.77 $$\mathop A\limits^o $$
D
0.53 $$\mathop A\limits^o $$
3
NEET 2022 Phase 2
MCQ (Single Correct Answer)
+4
-1

Let R1 be the radius of the second stationary orbit and R2 be the radius of the fourth stationary orbit of an electron in Bohr's model. The ratio $${{{R_1}} \over {{R_2}}}$$ is :

A
4
B
0.25
C
0.5
D
2
4
NEET 2022 Phase 2
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus

Given below are two statements

Statement I : The law of radioactive decay states that the number of nuclei undergoing the decay per unit time is inversely proportional to the total number of nuclei in the sample.

Statement II : The half of a radionuclide is the sum of the life time of all nuclei, divided by the initial concentration of the nuclei at time t = 0.

In the light of the above statements, choose the most appropriate answer from the options given below :

A
Statement I is incorrect but statement II is correct
B
Both statement I and statement II are correct
C
Both statement I and statement II are incorrect
D
Statement I is correct but statement II is incorrect
NEET Subjects