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Showing posts from July, 2017

VTU 1ST YEAR ENGG PHYSICS LAB EXPERIMENTS

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12.Black box experiment

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Experimental set up
*Ensure that input volage is 1V from the source  by setting it as shown below 



press 1. sin function button  2. 20V amplitude and set it to 1V 3. 1k button on frequency 



11. Photo diode

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Experimental set up


Measurement Measurement of PD current variation with LED power * during the measurement you must keep the voltage to -1.00V  ( -ve sign will not be shown in the display) 1. set the voltage to -1V and  vary the power  2. when power changes, eventualy  voltage will change so set the voltage back to -1V and take micro-     ammeter reading. Measurement of PD voltage variation with current  1.vary the voltage from 0.1 to 2.0 V and take corresponding micro-ammeter reading for particular power

10. Torsional Pendulum

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Experimental set up

Measurement1. focus the beam of light on the mirror of mi table such that it's reflected beam should be moving to and pro on the scale. 

 2.small jerk is given to rotate MI table  along the axis at an angle sweep( * it should not swing )






9. Determination of Fermi energy

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Experimental set up  set up the circuit as shown and take the readings

8.Uniform bending

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Experimental set up




How to focus @ the needle?
1.Keep a paper behind the needle
2.focus on the paper  3.gradually  move the travelling microscope toward the needle 4. align the needle as shown below in the figure
Reading the vernier scale 
Use convex lens to magnify the view 

The above figure shows magnified view of vernier reading
reading of above fig is       MSR  |  CVD | TR=MSR+(CVD*LC)cm      11.75   |   6      | 11.75+(6*0.001)=11.756

7.Dielectric constant

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Circuit connection
figure shows circuit connection , * ensure capacitor voltage to be zero @ the biginning as in the connection. How to bring the voltage across capacitor to complete  zero as in figure? *Disconnect the voltmeter wire and just connect (touch) it to  the other terminal of the voltmeter as in the figure.

6.Newtons rings

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The above figure shows you that light from the sodium lamp enters  the lens which is inclined  @ 45 degree angle.Experimental set up



*The instrument should be kept such that the light from sodium lamp should enter the first focusing lens

Newton's  rings




5.Diffraction grating

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Grating  Experiment set up

Graph sheet alignment

4.Verification of Stephan's law

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Circuit connections Detailed image of instument

3.Transistor charecteristics

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To study the output characteristics of transistorHow to identify the emitter, collector , base regions of the transistor ?the above figure shows a transistor with notch highlighted   :- from the notch if you move in a clockwise direction       you get 1)emitter , 2)collector,3)base    E→C→B
CIRCUIT CONNECTION


DETAILED IMAGES OF INSTRUMENTS




2.Series and Parallel Lcr

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Series Lcr
circuit connection


Parallel Lcr
circuit connection

Detailed images of instruments



1.I-V characteristics of Zener diode

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The image shows a ZENER-DIODE  How to identify the P-side and N-side of a zener diode? : - Red or saffron colour indicates its P-side of the diode : -Black colour indicates its N-side
Circuit connection


Detailed images of each instruments of the circuits for better understanding