The table displays the velocity of sound in various materials.Based on the data presented in the table, which of the following boys would be able to hear a rock falling off a cliff one kilometer away?
A• a boy lying down with his ear to the ground
B•a boy sitting in a tree with his ear to the bark
C• a boy sitting on the grass
D• a boy swimming in the water
To determine which boy would be able to hear a rock falling off a cliff one kilometer away, we need to consider the velocity of sound in different materials.
Based on the data presented in the table (which is not provided), we can assume that the velocity of sound is highest in solids, followed by liquids, and then gases.
A. A boy lying down with his ear to the ground:
If the table indicates that the velocity of sound in solid materials is high, then this boy would have a better chance of hearing the rock falling, especially if he can hear sound vibrations transmitted through the ground.
B. A boy sitting in a tree with his ear to the bark:
If the table indicates that the velocity of sound in solid materials is high, then this boy would also have a good chance of hearing the rock falling because the sound vibrations can travel through the solid tree bark.
C. A boy sitting on the grass:
If the table indicates that the velocity of sound in solid materials is high and the velocity of sound in gases (air) is low, then this boy would have a lower chance of hearing the rock falling as sound vibrations would not be transmitted well through the grass and air.
D. A boy swimming in the water:
If the table indicates that the velocity of sound in liquids (water) is high, then this boy swimming in the water would have a good chance of hearing the rock falling, as sound vibrations can travel efficiently through water.
Overall, without specific data from the table on the velocity of sound in different materials, it is not possible to definitively determine which boy would be able to hear the rock falling one kilometer away.