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Biology; Chemistry; Physics: Post your doubts here!

Muqeet Tahir Malik

Muqeet Tahir Malik

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usama321 said:
I was thinking why not first calculate the theoretical critical angle, by calculating the refractive index first by sin i/ sin r. Then get the theoretical critical angle by n = i/sin c. in the end, compare this with the experimental value.
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What is the experiment for measuring the effect of temperature on resistenc, how to used in circuit diagrams
 
F

fatima0000

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draw ray diagrams to show how each forms an image are produced by single lens as magnifying glass in projecter, camera, and photographic enlarger....
how can i deal with this?//
 
Saad Mughal

Saad Mughal

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usama321 said:
my question and this one is almost the same and i don't know much about it except giving a h0t water bath to increase the temperature. Saad Mughal please do check both our questions and help :(
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You're correct Usama, this sort of question came in one of the ATP's before too (I did it in class).
Equipment: Thermometer, Thermistor, Oil Bath/Water Bath, Stirrer, Heater.
The thermistor is immersed into the water bath and a thermometer is placed within the water bath (close to the thermistor). The water bath is heated using the heater and stirred frequently, it is heated until the thermometer gives the reading 90 deg. centigrade. The water in the bath is stirred and the heater is removed. After 10-15 seconds, the thermistor is at the same temperature as the water (i.e. 90 deg. centigrade). In this way, the temperature of the thermistor can be measured and varied.
I think this should be sufficient for 3-marks.
 
Saad Mughal

Saad Mughal

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fatima0000 said:
draw ray diagrams to show how each forms an image are produced by single lens as magnifying glass in projecter, camera, and photographic enlarger....
how can i deal with this?//
Click to expand...
Do you have the book "A complete course for O'level" by Charles Chew?
 
usama321

usama321

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Saad Mughal said:
You're correct Usama, this sort of question came in one of the ATP's before too (I did it in class).
Equipment: Thermometer, Thermistor, Oil Bath/Water Bath, Stirrer, Heater.
The thermistor is immersed into the water bath and a thermometer is placed within the water bath (close to the thermistor). The water bath is heated using the heater and stirred frequently, it is heated until the thermometer gives the reading 90 deg. centigrade. The water in the bath is stirred and the heater is removed. After 10-15 seconds, the thermistor is at the same temperature as the water (i.e. 90 deg. centigrade). In this way, the temperature of the thermistor can be measured and varied.
I think this should be sufficient for 3-marks.
Click to expand...

and it is the same for the wire temperature experiment, right? for different values of temperature of wire and the resistance.
 
Saad Mughal

Saad Mughal

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usama321 said:
and it is the same for the wire temperature experiment, right? for different values of temperature of wire and the resistance.
Click to expand...
Yes but for that you can do two things, either heat the wire then connect it to the circuit or you could just heat the wire while it is connected to the circuit.
 
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