Sound travels the fastest in:

1. liquids
2. solids
3. gases
4. vacuum

Sound persists in human ear for about :

1. 1 min
2. 30 sec
3. 25 sec
4. 0.1 sec

Assertion (A): For echo, sound should travel a minimum distance of atleast 33 m in air.

Reason (R): Distinct echo requires a minimum time delay of 0.1 s.

1. Both A and R are true and R is the correct explanation of A
2. Both A and R are true and R is not the correct explanation of A
3. A is true but R is false
4. A is false but R is true

Assertion (A): Sound travels faster in air than in liquids.

Reason (R): Particles are loosely packed in air in comparison to liquids.

1. Both A and R are true and R is the correct explanation of A
2. Both A and R are true and R is not the correct explanation of A
3. A is true but R is false
4. A is false but R is true