Light of wavelength 400nm is incident on two slits separated by 1000mm. the interference pattern from the slits is observed from a satellite orbiting 0.4mm above the earth. the distance between interference maxima as detected at the satellite is

a. 0.16mm.
b. 0.16km.
c. 0.16m.
d. 0.16mm.

Arigid tank is divided into two equal parts by a partition. one part of the tank contains 3 kg of compressed liquid water at 400 kpa and 60°c while the other part is evacuated. the partition is now removed, and the water expands to fill the entire tank. determine the entropy change of water during this process, if the final pressure in the tank is 40 kpa. use steam tables.