(ii) In a horizontal pipeline of uniform area of cross-section, the pressure falls by 5 N m−2 between two points separated by a distance of 1 km. Calculate the change in kinetic energy per kg of oil flowing at these points. Density of oil = 800 kg m−3.

2Medium10 marks

(i) What are the fringes of equal thickness and fringes of equal inclination ?

(ii) In a Newton's ring arrangement with a source emitting two wavelengths λ1 = 6 × 10−7 m and λ2 = 5.9 × 10−7 m, it is found that the mth dark ring due to one wavelength coincides with the (m + 1)th dark ring due to the other. Find the diameter of the mth dark ring, if the radius of curvature of the lens is 90 cm.

3Medium10 marks

Why are Raman active vibrations and IR vibrations in CO2 molecule complementary to each other?

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