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Physics
Which of the following pairs is an isobar?
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Q. Which of the following pairs is an isobar?
Manipal
Manipal 2011
A
${ }_{1} H ^{1}$ and ${ }_{1} H ^{2}$
B
${ }_{1} H ^{2}$ and ${ }_{1} H ^{3}$
C
${ }_{6} C ^{12}$ and ${ }_{6} C ^{13}$
D
${ }_{15} P ^{30}$ and ${ }_{14} Si ^{30}$
Solution:
Isobars are the elements which have same mass number. So, ${ }_{15} P ^{30}$ and ${ }_{14} Si ^{30}$ are isobars.