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Edexcel PHYSICS Doubts

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7ooD:
look for the above question it should be D as they want to know the potential difference at which the diode will conduct and the arrangement is set so that the diode wont conduct electricity but when we apply a large p.d it will conduct 

Saladin:

--- Quote from: 7ood on May 08, 2010, 03:45:23 pm ---how to get the Precision though??

--- End quote ---

This is what you have to do.

1. Find the mean
2. Then find the difference between the mean and the highest value
3.

Saladin:

--- Quote from: 7ood on May 08, 2010, 03:47:40 pm ---look for the above question it should be D as they want to know the potential difference at which the diode will conduct and the arrangement is set so that the diode wont conduct electricity but when we apply a large p.d it will conduct 

--- End quote ---

I still dont know why this answer is right.

Darth Austrakast:
here's a question i need help solving:
A student observes the diffraction of white light by holding a diffraction grating close to her eyes
a)draw a simple diagram to illustrate what the student observes
b) a tube of KMn04 solution is placed in front of white light source.Then the student views the filament through the solution with the grating close to her eyes. she notices that the blue, yellow and orange colors have vanished. Give an explanation.

Can you please help me asap? Thanks ! :)

Saladin:

--- Quote from: Austrakast on May 08, 2010, 04:05:09 pm ---here's a question i need help solving:
A student observes the diffraction of white light by holding a diffraction grating close to her eyes
a)draw a simple diagram to illustrate what the student observes
b) a tube of KMn04 solution is placed in front of white light source.Then the student views the filament through the solution with the grating close to her eyes. she notices that the blue, yellow and orange colors have vanished. Give an explanation.

Can you please help me asap? Thanks ! :)

--- End quote ---

What paper is this?

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