he 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? (1 point) Responses a boy sitting on the grass a boy sitting on the grass a boy swimming in the water a boy swimming in the water a boy lying down with his ear to the ground a boy lying down with his ear to the ground a boy sitting in a tree with his ear to the bark

Question

he 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? (1 point) Responses a boy sitting on the grass a boy sitting on the grass a boy swimming in the water a boy swimming in the water a boy lying down with his ear to the ground a boy lying down with his ear to the ground a boy sitting in a tree with his ear to the bark

Answer 1

To determine which of the boys would be able to hear a rock falling off a cliff one kilometer away, we need to consider the speed of sound in different materials.

Based on the table, the speed of sound in air is given as 343 meters per second. Since the distance is one kilometer (1000 meters), we can calculate the time it would take for the sound to travel one kilometer as follows:

Time = Distance / Speed
Time = 1000 meters / 343 meters per second
Time ≈ 2.91 seconds

Therefore, it would take approximately 2.91 seconds for the sound of the rock falling to reach a boy who is one kilometer away.

Now let's consider the options:

1. A boy sitting on the grass: The boy sitting on the grass would be able to hear the sound since the sound would reach him in approximately 2.91 seconds.

2. A boy swimming in the water: The boy swimming in the water would also be able to hear the sound since the sound would reach him in approximately 2.91 seconds.

3. A boy lying down with his ear to the ground: The boy lying down with his ear to the ground would be able to hear the sound since he would be in closer proximity to the sound waves traveling through the ground, which can transmit sound faster than air.

4. A boy sitting in a tree with his ear to the bark: The boy sitting in a tree with his ear to the bark might be able to hear the sound faster than those sitting on the grass since the sound waves could travel faster through the solid material of the tree bark compared to the air.

Therefore, all of the boys mentioned in the options would likely be able to hear the rock falling off a cliff one kilometer away.