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Determination of Planck's Constant
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 Procedure for Simulation

 

 

Place the mouse pointer over the components and click to drag wire.

 

 

  1. After the connections are completed, click on ‘Insert Key’ button.
  2. Click on the combo box under ‘Select LED’ button.
  3. Click on the ‘Rheostat Value’ to adjust the value of rheostat.
  4. Corresponding voltage across the LED is measured using a voltmeter,which is the knee voltage.
  5. Repeat, by changing the LED and note down the corresponding knee voltage.
     
  6. Calculate ‘h’ using equation  «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi»h«/mi»«mo»=«/mo»«mfrac»«mrow»«mi»e«/mi»«mi»§#955;«/mi»«mi»V«/mi»«/mrow»«mi»c«/mi»«/mfrac»«/math»
  7. The wave length of infrared LED is calculated by using equation,«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi»§#955;«/mi»«mo»=«/mo»«mfrac»«mrow»«mi»h«/mi»«mi»c«/mi»«/mrow»«mrow»«mi»e«/mi»«mi»V«/mi»«/mrow»«/mfrac»«/math»

 

 

Observations

 


 

 

Procedure for Real lab

 

  1. Connections are made as shown in circuit diagram.
  2. Insert key to start the experiment.
  3. Adjust the rheostat value till the LED starts glowing, or in the case of the IR diode, whose light is not visible, until the ammeter indicates that current has begun to increase.
  4. Corresponding voltage across the LED is measured using a voltmeter,which is the knee voltage.
  5. Repeat, by changing the LED and note down the corresponding knee voltage.
  6. Using the formula given,find the value of the Planck's constant.

 

 Results

 

 Planck’s constant           =     Js.
 Wavelength of IR LED    =      nm.

 


 

 

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