bids are invited for physics lab items 1 sextant 2 2 flywheel rotational speed 18, 500 to 36, 000 rpm input voltage 2 3 torsional pendulum 4 4 thomson method 2 5 spring constant 2 6 frank hertz experiment argon filled tetrode filament power supply : 2.6-3.4v continuously variable grids power supplies vg1k : 1.3-5v continuously variable vg2a : 1.3 - 12v continuously variable vg2k : 0 - 95v continuously variable all the power supplies should be highly stabilized and output voltages can be read on 3 ½ digit, 7 segment led dpm with autopolarity and decimal indication through a selector switch saw tooth waveform should be on cro display scanning voltage : 0-80v scanning frequency : 115±20hz multirange digital ammeter display : 3 ½ digit 7 segment led range multiplier : 10-7, 10-8 & 10-9 power: 220v±10% mains, 50 hz 2 7 f.e.t ( field effect transistor apparatus 4 8 inverse square law of radiation using photoelectric effect the setup consists of main uint having highly stabilized power supply, digital volmeter led 3 digit 0-999u adc light score ( 3 colour white blue red ) black box with spacers for distance variation 4 9 v-i characteristic of semiconductor material using diode 4 10 band gap of semiconductor material using diode 4 11 determination of g and velocity of free fall in body using digital time technique 4 12 dielectric constant apparatus 2 13 plancks constant apperatus using photoelectric the setup conssts of main unit having highly stabilized power supply digital voltmeter ( led 3 digit 0-9.99 v adc ) voltmeter ( led 3 digit 0-9.99 v adc ) light source ( 3 colours -white , blue, red, black with spacers for distance variation.