Compact Unit is Easy to Set Up and UseNow your students can repeat the experiment that led to Einstein’s quantum theory of radiation—that energy carried by incoming radiation has a basic energy level or some multiple of it (is quantized). With this device, your students can calculate and plot:• Einstein’s relationship (E-hc/ë)• Planck’s constant• Average cutoff voltage• Reciprocal wavelength• Stopping potential, volts• Spectral responseThe unit contains a built-in IP39 phototube with power supply, connected to a FET-input op-amp. Output is measured on a built-in panel meter, graduated in nA. Adjustment knobs are provided for phototube stopping voltage and amplifier zero-point. Sensitivity is at least 0.5nA. Comes with 3 color filters for wavelengths of 436nm, 546nm, and 580nm. Connects to 110VAC. Unit measures 17cm x 9cm x 10cm. Full instructions are included. You need to supply a white fluorescent or a tungsten lamp to use with the unit’s filters (for best results, use a monochromatic light source like a mercury arc lamp, sodium arc lamp, or He-Ne laser without the filters). You’ll also need a multimeter for measuring the stopping voltage.
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