Special Relativity Answered Questions with
Verified Solutions 100% Correct | 2025 Update
material in space that vibrates to transmit light through space - ANSWER ether
1) laws of physics are the same for all frames of reference moving at constant
velocity with respect to one another
2) the velocity of light in a vacuum is the same for all observers, regardless of their
states of motion of the motion of the source of light - ANSWER Einstein's
theory of special relativity
L = L₀√(1- (v²c²))
L₀ = length of the object as measured by someone moving along with it in an
internal frame of reference
L = length rod appears to be contracted - ANSWER length contraction
v = 1/√(1- (v₀²/c²))
- v = relativistic fact, v₀ = speed of moving observer, c = speed of light -
ANSWER The relativistic factor is the amount by which moving clocks slow
down and lengths contract as seen by an observer compared to those of another
observer moving a speed v
t = t₀/√(1- (v²c²))
, t₀ = proper time measured by a clock moving with observer - ANSWER time
dilation
m = m₀/√(1- (v²c²)) - ANSWER mass- special relativity
p = mv = m₀v/√(1- (v²c²)) - ANSWER relativistic momentum
the law of physics are the same for all inertial frames of reference - ANSWER
What is one of the postulates of special relativity?
L = L₀√(1- (v²c²))
L₀ = 1.0m, v = 0.5c
L = 1√(1- ((0.5c)²c²)) = √(1- (0.5²)) = √(1 - 0.25) = √(0.75) = 0.87 m - ANSWER
What is the perceived length of a meter stick if it is moving with a velocity of 0.5c
relative to Earth?
Use E=mc² = (9.1•10⁻³¹)(9•10¹⁶) = 8.14•10⁻¹⁴ J = 0.512 MeV - ANSWER What is
the energy equivalent of an electron at rest?
9.1•10⁻³¹ kg - ANSWER What is the mass of an electron?
6.24•10¹⁸ eV - ANSWER How many eV in 1 J?
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