AIPMT 2011 Mains | Atoms and Nuclei Question 58 | Physics

An electron in the hydrogen atom jumps from excited state n to the ground state. The wavelength so emitted illuminates a photosensitive material having work function 2.75 eV. If the stopping potential of the photoelectron is 10 V, then the value of n is

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

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

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

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 Prelims

MCQ (Single Correct Answer)

-1

Fusion reaction takes place at high temperature because

nuclei break up at high temperature

atoms get ionised at high temperature

kinetic energy is high enough to overcome the coulomb repulsion between nuclei

molecules break up at high temperature

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