1. In a laboratory, Mr. Raonok performs a Young's double slit aperiment in a medium of air, where distance between the tow slits was and distance of the screen from slits was . He finds the distance from center maxima to the 16 th maxima was . Again, Mr. Raonok peformed the same experiment in a medium of refractive index 1.66 .
2. When and resistors are connected parallelly in a circuit, 1 A current flows when the circuit is connected to an emf source of .
3. An engine absorbs heat from source at temperature and rejects some amount of heat to the sink at temperature.
4. diagram of an engine is shown in the figure: