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Phy Formulas > Formulas > Flashcards

Formulas Flashcards

1
Q

hυ/mc^2 is

A

Dimensionless

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2
Q

Dimension of Planck’s Constant is

A

M L^2 T^-1

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3
Q

Acceleration along an inclined plane is

A

A = g sin theta - mu x g cos theta

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4
Q

Beta that is k^2/R^2 for disc, ring, solid sphere, and hollow sphere.

A

1/2. 1. 2/5. 2/3.

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5
Q

When velocity is maximum

A

Acceleration is zero

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6
Q

Escape velocity Ve equal to

A

Square root 2 GM /R

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7
Q

Velocity in terms of h and g

A

Square root 2gh

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8
Q

Latent heat of steam

A

540

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9
Q

Q is equal to (thermal)

A

Ms delta T

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10
Q

Proportionality of Lambda m at which radiation of emission from a black body at Max temperature is

A

Lambda m proportional to T raise to minus one

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11
Q

V1 Rms / V2 RMS equal to( in terms of Temperature)

A

Square root T1/T2

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12
Q

At constant volume Q is equal to where cv =

A

n cv Delta T

Cv = f R/ 2

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13
Q

At constant pressure Q = and cp =

A

N cp delta T

Cp = (f/2 +1) R

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14
Q

Degree of freedom f of Mono di and tri atoms

A

Mono 3 di 5 and tri 7

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15
Q

Beta =Q2/W =

A

T1/T2-T1

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16
Q

For x forks there would be

A

X-1 pairs

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17
Q

Amplitude =

A

Ao ^ - b(t) /2m ( t = no of oscillation x T)

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18
Q

beryllium 3 + mass is how many times proton charge is is how many times proton

A

Mass is 9 times proton and charge 3 time proton

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19
Q

Standing wave particles are all at

A

Same phase

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20
Q

Time taken by a pulse to travel from lower end to the midpoint of the rope in a transverse wave is

A

Sq root 2L/g

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21
Q

If waves are originating from a point source is an amplitude at a distance r from the source is related as

A

Amplitude inversely proportional to r (distance)

22
Q

Period of revolution of artificial satellite is given as

A

2 pi square root R cube/GM

23
Q

A uniform spherical shell gradually shrink maintaining its shape the gravitational potential at its Centre will (with mass of the shell being constant)

A

Decrease

24
Q

If displacement time graph is given of a simple harmonic motion how is its force time graph given

A

Just it’s negative

25
Q

U tube with liquid moves with a horizontal acceleration A along the direction joining the two limbs. The separation between these is D. what is the difference in their liquid level.

A

AD/g

26
Q

Vrms in case of p and v

A

Square root 3 PV/m

27
Q

Specific heat of gas undergoing adiabatic change is

A

Zero

28
Q

Net rate of heat loss is equal to

A

Emissivity x Sigma( t1^4- t2^4) A

29
Q

Two vector A and B have an angle theta between them then value of magnitude a minus b will be

A

2 sin theta by 2

30
Q

Kinetic energy of a particle moving in a straight line is proportional to the time the magnitude of force acting on the particle is

A

Force is inversely proportional to velocity/ speed

And force is inversely proportional to square root of t

31
Q

Two disc of equal radius and mass are kept in contact third disc of same mass but double radius strike them symmetrically after impact the coefficient of restitution is

A

9/ 16

32
Q

When a body is rolling without slipping on a horizontal surface the equation used to find work

A

1/2 mv^2 [1 + beta]

33
Q

t1+t2/myu = t1/myu1 +t2/myu2

A

Learn it

34
Q

Capacitor c and resistance are joined in series and connected to a source of voltage v and angular frequency Omega. find power dissipated

A

V^2 R/(R^2 +1/Omega^2 C^2)

35
Q

Diffraction pattern is obtained by using a beam of yellow light what happens if the yellow light is replaced by red light

A

Diffraction band becomes broader

36
Q

Intensity through polariser

A

io cos^2 theta

37
Q

Potential energy in terms of P and E when is potential energy maximum and minimum

A

-PEcos thetha when angle between p and e is pi potential energy is maximum and when angle between them is zero it is minimum

38
Q

A Proton and electron are placed in a uniform electric field then

A

The magnitude of the forces acting on them will be equal

39
Q

Mutual inductance m is equal to

A

Phi/ i

40
Q

LCR circuit value v equal to

A

Sq root( iR) ^2 + (XL i-Xc i) ^2

41
Q

What is the Ripple factor of half wave rectifier

A

1.21

42
Q

If refractive index of medium in which lens is placed is more than the refractive index of lens then behaviour of lens

A

Will be opposite

42
Q

If refractive index of medium in which lens is placed is more than the refractive index of lens then behaviour of lens

A

Will be opposite

43
Q

Shift in wavelength is given by the equation

A

Delta Lambda is equal to velocity/c x lambda

44
Q

Coefficient of friction myu is equal to

A

Acceleration / g

45
Q

For transistor action BE Junction is

And doping profile

A

Forward baised

E>C>B

46
Q

For transistor action BC junction is

And length profile

A

Reverse biased

C>E>B

47
Q

The angular momentum of a system of particles is conserved when

A

When No external torque acts on the system

48
Q

In satellite the relation between time period and radius

A

T^2 directly proportional to R^3

49
Q

Cv=

A

R/gama - 1

Phy Formulas (1 decks)

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