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Physics: Post your doubts here!

Catherine_1

Catherine_1

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photoelectric effect.png
Hey,
Could anyone please provide me with the reasoning for the following questions of the photoelectric effect:
a) In graph 2 why does increase in frequency cause current to increase at a decreasing rate?
b)In graph 3 and 4 , what does negative stopping potential imply?Like what exactly does it mean?

Please help.:)
 
The Sarcastic Retard

The Sarcastic Retard

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nehaoscar said:
ii
intially ke + gpe = epe
so ke = epe - gpe

iii
fusion may occur
Click to expand...

intially ke + gpe = epe
<------ how do u know this? :p

How do u know exact answers as ms?? :p
u use exact word.. How u know this all thingssssss??
I can never think this as u think :(
 
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nehaoscar

nehaoscar

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The Sarcastic Retard said:
intially ke + gpe = epe
<------ how do u know this? :p

How do u know exact answers as ms?? :p
u use exact word.. How u know this all thingssssss??
I can never think this as u think :(
Click to expand...
cause at the start they have ke and are far apart so have gpe
As they come closer gpe decreases and ke becomes zero so these 2 energies converted to epe
lol practice and you'll know how to do it :)
 
Catherine_1

Catherine_1

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Can anyone please suggest good resources/files for Eddy currents and Cathode ray Oscilloscope and photoelectric current?:p :)The mass-energy concept in nuclear physics too?:D
Also, can anyone explain the syllabus statement 25.2 d)?:)
The statement is-: Explain why maximum photoelectric energy is independent of intensity,whereas the photoelectric current is proportional to intensity?:)

Lastly,:p what is galvanometer in the null method?:p

:)
 
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The Sarcastic Retard

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nehaoscar said:
cause at the start they have ke and are far apart so have gpe
As they come closer gpe decreases and ke becomes zero so these 2 energies converted to epe
lol practice and you'll know how to do it :)
Click to expand...
Min Ke = Max Pe
Ke = EPE - GPE. (Always GPE < EPE) If I say this, is my way correct?
 
nehaoscar

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holoholo said:
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s04_qp_4.pdf
Question 6 Explanation please
Click to expand...
compression of ideal gas at constant temp : internal energy is proportional to it's ke which is proportional to temperature
Since it's at constant temp. U must be 0. and since work is done on the system W is + so for U to be 0, q has to be -

Heating of solid with no expansion : w is 0 and since it's heated q is + so U is +

Melting of ice : no external work is done on the system so w is 0. melting = heated so q is + and so U is +
 
Catherine_1

Catherine_1

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In smoothing circuits, why does increasing capacitance of the capacitor and resistance of the load result in more smoothing?Also,why is it difficult to change the value of voltage quickly if the two have higher values?:):)

Does anyone have notes for alternating current chapter?:p :D
 
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