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Byju's Answer
Standard XII
Physics
Body in Water
When a rod mo...
Question
When a rod moves at a relativistic speed v, its mass
A
must increase by a factor of
γ
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B
may remain unchanged
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C
may increase by a factor other than
γ
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D
may decrease
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Solution
The correct option is
A
must increase by a factor of
γ
Mass of moving object
m
=
m
o
√
1
−
v
2
c
2
=
m
o
γ
where
m
o
is the rest mass and
γ
=
1
√
1
−
v
2
/
c
2
Thus mass of the moving rod must increases by a factor of
γ
.
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Similar questions
Q.
When a rod moves at a relativistic speed v, its mass
(a) must increase by a factor of γ
(b) may remain unchanged
(c) may increase by a factor other than γ
(d) may decrease
Q.
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(a) must be equal to L'
(b) may be equal to L
(c) may be more than L' but less than L
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