Instructions

When liquid medicine of density $$\rho$$ is to be put in theeye, it is done with the help of a dropper. As the bulb onthe topof the dropperis pressed, a drop forms at the opening of the dropper. We wishto estimate the size of the drop. Wefirst assume that the drop formed at the opening is spherical because that requires a minimum increase in its surface energy. To determine the size, we calculate the net vertical force due to the surface tension T when the radius of the drop is R. When this force becomes smaller than the weight of the drop, the drop gets detached from the dropper.

Question 51

Question 52

# After the drop detaches, its surface energy is

Instructions

The key feature of Bohr's theory of spectrumof hydrogen atomis the quantization of angular momentum whenanelectron is revolving around a proton. We will extend this to a general rotational motion to find quantized rotational energy of a diatomic molecule assuming it to be rigid. The rule to be applied is Bohr's quantization condition.

Question 53

Question 54

Question 55

# In a CO molecule, the distance between C (mass = 12 a.m.u.) and O (mass = 16 a.m.u.), where 1 a.m.u. $$= \frac{5}{3} \times 10^{-27}$$ kg, is close to

Instructions

For the following questions answer them individually

Question 56

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