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ALL CIE PHYSICS DOUBTS HERE !!!

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silvercameron:
this one's from nuclear physics:
if (dN/dt) is directly proportional to N, then when we write the equation as (dN/dt)= (-lambda)t, where lamda is the decay constant, why does the constant have the negative sign before it?

This one is from ideal gases:
how is the equation pV=nkT derived?

kruti1996:
Hi people,
 please help me out with June 2012, paper 11, question 12.
thank you

astarmathsandphysics:

--- Quote from: silvercameron on January 10, 2013, 04:11:20 pm ---this one's from nuclear physics:
if (dN/dt) is directly proportional to N, then when we write the equation as (dN/dt)= (-lambda)t, where lamda is the decay constant, why does the constant have the negative sign before it?

This one is from ideal gases:
how is the equation pV=nkT derived?



--- End quote ---

N is decreasing so dN is negative. dN is the change in N in a time period dt. If N is decreasing, at the end of the time period there are less atoms than at the start.

astarmathsandphysics:

--- Quote from: kruti1996 on July 04, 2013, 03:16:17 am ---Hi people,
 please help me out with June 2012, paper 11, question 12.
thank you


--- End quote ---

astarmathsandphysics:
how is the equation pV=nkT derived?

here

http://www.astarmathsandphysics.com/a_level_physics_notes/thermal_physics_and_gases/a_level_physics_notes_kinetic_theory_of_gases.html

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