AIPMT 2012 Prelims | Atoms and Nuclei Question 56 | Physics

Electron in hydrogen atom first jumps from third excited state to second excited state and then from second excited to the first excited state. The ratio of the wavelengths $$\lambda $$₁ : $$\lambda $$₂ emitted in the two cases is

$${7 \over 5}$$

$${27 \over 20}$$

$${27 \over 5}$$

$${20 \over 7}$$

AIPMT 2012 Prelims

MCQ (Single Correct Answer)

-1

Out of Syllabus

If the nuclear radius of ²⁷Al is 3.6 fermi, the approximate nuclear radius of ⁶⁴Cu in fermi is

2.4

1.2

4.8

3.6

AIPMT 2011 Mains

MCQ (Single Correct Answer)

-1

Out of the following which one is not a possible energy for a photon to be emitted by hydrogen atom according to Bohr's atomic model?

0.65 eV

1.9 eV

11.1 eV

13.6 eV

AIPMT 2011 Mains

MCQ (Single Correct Answer)

-1

Out of Syllabus

Two radioactive nuclei P and Q, in a given sample decay into a stable nucleus R. At time t = 0. number of P species are 4 N₀ and that of Q are N₀. Half -life of P (for conversion to R) is 1 minute where as that of Q is 2 minutes. Initially there are no nuclei of R present in the sample. When number of nuclei of P and Q are equal, the number of nuclei of R present in the sample would be

2 N₀

3 N₀

$${{9{N_0}} \over 2}$$

$${{5{N_0}} \over 2}$$

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