The table displays the velocity of sound in various materials.
Substance Speed(meters per second)
Air 344
Water 1,437
Rock 3,000
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 swimming in the water
a boy sitting in a tree with his ear to the bark
a boy lying down with his ear to the ground
a boy sitting on the grass
The boy sitting on the grass would be able to hear a rock falling off a cliff one kilometer away. The speed of sound in air is 344 meters per second, which means it would take sound approximately 2.9 seconds to travel one kilometer.
The diagram underneath depicts the manner in which light reflects from a glossy surface, like that of a mirror. According to the law of reflection, what is probably accurate regarding the illustration? (1 point) Responses
Light undergoes refraction upon striking the glossy surface.
Light is reflecting in the direction indicated by T.
The angle created by S and T is equal to the angle formed by T and U.
The angle formed by S and T is equivalent to the angle formed by S and R.