Question/Answer

UNIT 1 : MECHANICS

Units and Measurement – ...

SCALAR AND VECTOR

Work, Energy and Power

Circular Motion

Gravity and Gravitation

Simple Harmonic Motion

Angular Momentum

Angular Momentum

LAW OF CONSERVATION OF ANGULAR MOMENTUM

LAW OF CONSERVATION OF ...

UNIT 3 : GEOMETRICAL OPTICS

UNIT 4 : ELECTROSTATICS

Fundamental Electrostatic Phenomena

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To prove P= NKT

SHOW THAT P = N_v KT

Where N_v = No of molecules per unit volume

PROOF

According to kinetic equation of pressure

P = 1/3 r v2 ………………(1)

We know that:

r = mass / volume
r = mN / V
Putting the value of “r” in equation (1)

P = 1/3 mN/V v2

P = 1/3 N/V mv2……………(2)But N/V = no of molecules per unit volume
i.e.
N/V = Nv
Putting the value of N/V in eq (2)
P = 1/3 Nv mv2
Multiply and dividing by 2 on R.H.S
P = 2/3 Nv (1/2mv2)
P = 2/3 Nv 3/2 KT [1/2mv² = 3/2 KT]
P = Nv KT

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