Q1. Light passes through a 230 lines/mm grating and is observed on a 1.0m wide screen located 1.3m behind the grating. Three bright fringes are seen on both sides of central maximum.
Max wavelength and Min wavelength?
Q2. A rectangular block of ice 13 m on each side and 1.4 m broad floats in sea water. The density of the sea water is 1025 kg/m3. The density of ice is 917 kg/m3.
a) How high does the top of the ice block float above water level?
b) How various penguins of mass 16 kg each can stand on the ice block before they get their feet wet?