quotations for supply of laboratory equipments of physics , to study the zero-crossing detector and comparator. , to determine the boltzmann constant using i-v characteristics of pn junction diode , to determine work function of material of filament of directly heated vacuum diode complete complete , to determine the wavelength of h-alpha emission line of hydrogen atom , measurement of susceptibility of paramagnetic solution ( quincks tube method ) complete , to determine the hall coefficient of a semiconductor sample. , to determine the wavelength and velocity of ultrasonic waves in a liquid ( kerosene oil, xylene, etc. ) by studying the diffraction through ultrasonic grating , to verify the stefans law of radiation and to determine stefans constant , digital electronics trainer kit , amplitude modulation & demodulation , frequency modulation , babinet compensator setup