Question

QuesTion:

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$\bf \: Activity \: writing$


Write an activity on the topic :-

◍ To study effect of intensity of light on an ldr.


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★ Aim
★ Apparatus
★ Procedure
★ Observation record
★ Conclusion
★ Precaution​s


$\bf{\pink{All \: \: the \: \: best \: ! \: ♡}}$
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Answer 1

$\bf \huge \colorbox {bl}{★ANsWeR★}$

$\bf \underline \colorbox {pink}{★ Aim :-}$

To study effect of intensity of light ( by varying distance of the source ) on an LDR.

$\bf \underline \colorbox {pink}{★ Apparatus :- }$

Light source , light dependent resistors (L.D.R.s) of different variety , a multimeter (or meter bridge ) , a source of intense light ( a lamp bulb with battery eliminator ) and a convex lens.

$\bf \underline \colorbox {bl}{★ Light Dependent Resistor :-}$

The light independent resistance are the devices for detecting and measuring electromagnetic waves ( light etc ) . It's working is based upon the principle of variation of the photoconductivity when radiation is incident upon it and absorbed by it.

A light dependent resistor is prepared from cadmium sulphide . It's resistance depends upon the intensity and duration of light incident on it. A good quality LDR shows resistance variation from 1 MΩ in complete darkness to about 10 Ω in full daylight. The intensity of light decreases inversely with increase the square of distance.

$\bf \underline \colorbox{pink}{★ Procedure :- }$

1] Turn the selector switch and set it on R for the measurement of resistance , in multimeter.

2] Plug the metallic ends of black probe in terminal marked common in multimeter and that of red in terminal marked as P (or + ) . Short The other metallic ends and adjust the 'R adjusting ' to get full scale deflection reading at zero ohm in the metre.

3] Touch the metallic probes to the two metal ends of the L.D.R. [ Fig. (a) ] and read the value of resistance when (a) the source is kept at a distance of to 2cm , pics in the source of light in a stand and keeping the L.D.R. vertically below it.

(i) Moving the source to 4 centimetre distance from the L.D.R. and

(ii) Moving the source 6 , 8 and 10cm from L.D.R. and repeating observation three more times.

$\bf \underline \colorbox{pink}{★ Observation record :- }$

[ Note :- r.e.f the above attachment ]

$\bf \underline \colorbox{pink}{★ Conclusion :- }$

When the distance between light source and L.D.R. increases the resistance of L.D.R. decreases.

$\bf \underline \colorbox {b}{༆ NOTE :- }$

Same activity can be done by varying the light exposure time in steps for same source of light, same LDR and for same distance.

$\bf \underline \colorbox{pink}{★ Precautions :- }$

1] No stray light should fall on the L.D.R. it is better to work in a dark room.

2] Connect L.D.R. carefully to the voltage source.

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Answer 2

Explanation:

QuesTion:

Activitywriting\bf \: Activity \: writingActivitywriting

Write an activity on the topic :-

◍ To study effect of intensity of light on an ldr.

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Pointstoremember:

★ Aim

★ Apparatus

★ Procedure

★ Observation record

★ Conclusion

★ Precautions

Allthebest!♡\bf{\pink{All \: \: the \: \: best \: ! \: ♡}}Allthebest!♡