Qualification > Sciences
Edexcel PHYSICS Doubts
Ascer Zayan:
--- Quote from: The Mysterious Dude on May 08, 2010, 03:56:42 pm ---This is what you have to do.
1. Find the mean
2. Then find the difference between the mean and the highest value
3.
--- End quote ---
This is to find Percentage of Uncertainty right??????
cuz i am losstttttt in physics Unit 3 :(
Saladin:
--- Quote from: Ascer Zayan on May 11, 2010, 12:24:19 pm ---This is to find Percentage of Uncertainty right??????
cuz i am losstttttt in physics Unit 3 :(
--- End quote ---
No, in the markscheme, it says that you have to find it in GPa. I know this paper had a bad mark scheme.
7ooD:
i dnt get question 4 lool my teacher answered it A but in markscheme D i kno but i think they have some idea that a diode cant always stop current from passing like for example we have to apply a great voltage in order it pass current we need astarphysicsandmaths to finish this :D
vanibharutham:
A diode is a device that only allows current to flow in one direction. That is why it is used in rectification i.e. changing AC to DC.
When a diode is forward biased it will allow current to pass through, as in 4 A
However, when a diode is reverse biased it will not allow current to pass through, as in 4 D
to completely understand how diodes work would go past the A level syllabus as you would need to understand P and N type semi conductor doping and then valence and conduction bands. With that, you will be able to explain why the diode conducts in one direction.
But for A level just know that if the anode of a diode is connected to the positive terminal of a power supply it is considered Forward Biased and will allow conduction.
Darth Austrakast:
--- 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 ---
can't anyone solve this question? ???
it would be really helpful...............exams are less than 24 hours away!
so please help
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version