air:344
water:1,437
Rock:3,000
based on the data in the table which of the following boys would be able to hear a rock falling of a cliff one kilometer away.
A. a boy lying down with his ear to the ground
B. a boy swimming in the water
C. a boy sitting in a tree with his ear to the bark
D. a boy sitting on the grass
Based on the data in the table, the speed of sound in air is 344 meters per second. Therefore, a boy sitting on the grass, which is on land, would be able to hear a rock falling of a cliff one kilometer away.
A. A boy lying down with his ear to the ground may potentially hear the rock falling, but it would depend on the composition of the ground and how well sound travels through it.
B. A boy swimming in the water would not be able to hear the rock falling because the speed of sound in water is much faster than in air, at 1,437 meters per second.
C. A boy sitting in a tree with his ear to the bark would also not be able to hear the rock falling because sound does not transmit well through tree bark.
Therefore, the correct answer is D. A boy sitting on the grass.