COMEDK 2021 | Atoms and Nuclei Question 27 | Physics

Ba-122 has half-life of 2 min. Experiment has to be done using Ba-122 and it takes 10 min to set up the experiment. It initially 80 g at Ba-122 was taken, how much Ba was left when experiment was started?

2.5 g

5 g

10 g

20 g

COMEDK 2021

MCQ (Single Correct Answer)

-0

When the speed of light becomes $$\frac{2}{3}$$ of its present value, then the energy released in a given atomic explosion would

decrease by a factor $$\frac{2}{3}$$

decrease by a factor $$\frac{4}{9}$$

decrease by a factor $$\frac{5}{9}$$

decrease by a factor $$\frac{\sqrt5}{9}$$

COMEDK 2020

MCQ (Single Correct Answer)

-0

An electron of an atom transits from $$n_1$$ to $$n_2$$. In which of the following maximum frequency of photon will be emitted?

$$n_1=1$$ to $$n_2=2$$

$$n_1=2$$ to $$n_2=1$$

$$n_1=2$$ to $$n_2=6$$

$$n_1=6$$ to $$n_2=2$$

COMEDK 2020

MCQ (Single Correct Answer)

-0

Two protons are kept at a separation of 40 $$\mathop A\limits^o $$. F$$_n$$ is the nuclear force and F$$_e$$ is the electrostatic force between them. Then,

$$F_n< < F_e$$

$$F_n\approx F_e$$

$$F_n> > F_e$$

$$F_n= F_e$$

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