Exp- To determine Planck’s Constant by Cs Photocell.
Principle and Working:
Einstein postulated that light consists of a quantum of particles, called photon whose energy E is proportioned to the frequency n, by an equation, E = hn, where h is planck’s constant.
In this experiment, narrow band interference filters are used to select wave length, each filter selects precisely one spectral line from the light of a high pressure mercury lamp. The monochromatic light falls on the cathode of the photocell. A capacitor, connected between cathode and anode of photocell, charged by anode, is used. Electrometer amplifier is used to measure the voltage at capacitor without current.
|Cat. No.||Item Name||Qty.|
|SE080||Power Supply 12V AC/DC 5Amp||1|
|SW440||Mercury Light Source||1|
|SL754||Convex lens in holder||1|
|R7901A||Set of Color Filters (Indian/Imported)||1|
|SEB15||Capacitor, 100 pF , 630 V||1|
|SEB38||Push Switch module||1|
|SN203||Flexible plug lead red (50 cm)||1|
|SN200||Flexible plug lead black(50 cm)||1|
|SN207||Flexible plug lead Yellow (100 cm)||1|
|SN206||Flexible plug lead Yellow (50 cm)||2|
|SN201||Flexible plug lead black(100 cm)||1|
|SN204||Flexible plug lead Red(100 cm)||1|
Available on Request
Four Interference Filters (C0449A) instead of Six Color Fiters (R7901A)