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Physics Help HERE ONLY !!

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astarmathsandphysics:

--- Quote from: islu_jf on May 29, 2009, 06:55:44 pm ---Can u pleeeeeeeeeeeeeeeezzz tel me what is LDR and and the light emittng one.. what are they used for??????

--- End quote ---

LDR might be used yo turn streetlamps on at night. The  detect the light level  and when the light falls below a certain level the lights turn on

LEDs are used a light in electronics as one switches
Both are semiconductors and dont consume much power

astarmathsandphysics:

--- Quote from: cactus_360 on May 29, 2009, 06:57:28 pm ---linearity means that distance between each degree on da scale is the same!!!

--- End quote ---

yes

Lotus21:
Hi everyone,

Please may you help me with these two questions:

1) A scientist wishes to investigate the deflection of ?-particles by an electric field. Draw a labelled diagram to suggest a suitable experimental arrangement. (Paper 3 November 2005) I don't even know how to draw electric field lines.

2) How to expand a) sensitivity b) range of a thermometer.

Thanks a lot.

Kasa:

--- Quote from: Lotus21 on May 29, 2009, 07:47:20 pm ---Hi everyone,

Please may you help me with these two questions:

1) A scientist wishes to investigate the deflection of ?-particles by an electric field. Draw a labelled diagram to suggest a suitable experimental arrangement. (Paper 3 November 2005) I don't even know how to draw electric field lines.

2) How to expand a) sensitivity b) range of a thermometer.

Thanks a lot.

--- End quote ---


Hi,
I am not sure about your first question, but i do know the answer to the second.

To expand the sensitivity of a thermometer:
You make the capillary tube finer so that when the liquid expands it has a longer distance to travel.
Also, you could make the bulb of the thermometer bigger.
I don't know about the range though..

Hope this helps!

islu_jf:
1)  Put on one side the source and ratemeter and a detector on the other side..
     now b/w them u put after the source a sheet bt it has a hole in it.. and then after that u put a Y-plates kind.. for the "charged metal plates"

2) for sensitivity..
u know there are lines on the thermometer ... u make these lines closer together.. so any slight change.. it will be detected./
and for the range .. make the two fixed points have a large differnce b/w them..
 I hope u'll understand. :)

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