bids are invited for measurement of plancks constant using black body radiation and photodetector , to determine the plancks constant using leds of at least4 different colours , to determine the wavelength of the h-alpha emission line of hydrogen atoms , to determine the ionization potential of mercury , to determine the value of em by bar magnet , to determine the value of em by magnetic focusing , to determine the wavelength of the laser source using diffraction of double slit , to show the tunneling effect in tunnel diodes using iv characteristics. , to determine mechanical equivalent of heat j by callender and barnes constant flow method , to determine stefans constant , to determine the coefficient of thermal conductivity of cu by searles apparatus. , to determine the coefficient of thermal conductivity of a bad conductor by lee and charltons disc method by steam or electrical heating , to determine the temperature coefficient of resistance by platinum resistance thermometer , to study the variation of thermo emf across two junctions of a thermocouple with temperature total quantity : 56