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Assertion (A): Balloons made by nylon films are better for containing helium than the conventional rubber balloons.
Reason (R): R.M.S. velocity of helium is very high. So helium atoms can effuse out through rubber balloons.
Both $A$ and $R$ are correct and $R$ is the correct explanation of $A$ .
Both $A$ and $R$ are correct and $R$ is not the correct explanation of $A$ .
$A$ is true but $R$ is false.
$A$ is false but $R$ is true.

A

Both

A

and

R

are correct and

R

is the correct explanation of

A

.

B

Both

A

and

R

are correct and

R

is not the correct explanation of

A

.

C

A

is false but

R

is true.

D

A

is true but

R

is false.

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