Category Archives: Relativity

Can someone travel faster than speed of light

Can there be something faster than speed of light? This is the question that occasionally come into mind of physics students. The speed of light is 3 x 100000000(meter/sec. Basically the answer of this question lies in the Einstein postulates … Continue reading

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Common queries related to theory of relativity-1

Q1. Who proposed the theory of relativity? Ans: Albert Einstein. Q2. What is the difference between general theory of relativity and special theory of relativity? Ans: General Theory of relativity: This theory deals with the the accelerated objects. Special theory … Continue reading

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No signal can travel faster than the speed of the light

Proof that no signal can travel faster than the speed of the light. Solution: Method 1 As relativistic addition of velocity relation is already derived and from Addition of velocity relation u = (u’ + v)/ (1 + u’(v/c2)) Suppose … Continue reading

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Lorentz transformation equations for space and time

Results of Galilean Transformation equations can not be applied for the objects moving with a speed comparative to the speed of the light. Therefore new transformations equations are derived by Lorentz for these objects and these are known as Lorentz … Continue reading

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Michelson-Morley experiment

Aim of the Michelson-Morley experiment: The Michelson-Morley experiment was done to confirm the presence of hypothetical medium called ether. Therefore, one question should be there what was ether? Yes, I have used “was ether” not “is ether”. Let us discuss … Continue reading

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Real life example of time dilation

Real example of time dilation: As we have already discussed the concept of time dilation. Let us discuss its example: Decay of µ- mesons: µ- mesons are the particles formed in the earth atmosphere. The half life time of µ- … Continue reading

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Variation of mass with velocity and its derivation

Do you know that there is variation of mass with velocity in relativity that is mass varies with the velocity when the velocity is comparable with the velocity of the light. Let us derive and discuss the variation of mass … Continue reading

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Relativistic addition of velocity

Let there are two inertial frames of references S and S’. S is the stationary frame of reference and S’ is the moving frame of reference. At time t=t’=0 that is in the start, they are at the same position … Continue reading

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Relativistic energy-momentum relation derivation

Relativistic energy momentum relation: From Einstein mass energy relation E = mc2 (1) Also from variation of mass with velocity relation m = m0/(1 – v2/c2)1/2 (2) Where m0 is the rest mass of the object Put value of m … Continue reading

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Simultaneity in relativity

Let there are two inertial frames of references S and S’. S is the stationary frame of reference and S’ is the moving frame of reference. At time t=t’=0 that is in the start, they are at the same position … Continue reading

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