To investigate the Lambert’s distance law.



Experimental Procedure:

  1. Switch on measuring amplifer.
  2. Mount the thermopile at a separation of L=600 mm from the heat source,connect to the measuring amplifier,the offset should be very low(background radition).
  3. Connect up the heat source and switch ON.
  4. Set the power regulation on the measuring amplifier to 4-5 and wait till the temperature become constant.
  5. Take the series of measurements by reducing the separation L in steps of 50mm and measure teh irradiance E and the reading of teh separation L.

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