Question 10
Source instructions: For multiple choice problems circle the right answers. Some problems may have more than one right answer. For essay problem, give explanation briefly.
A person is standing near a wall.
If he shouted “Hello” and his echo is heard in 0.1 second, how far is the wall from the person? (the speed of sound in the air is 340 m/s)
A person is standing near a wall.
If he shouted “Hello” and his echo is heard in 0.1 second, how far is the wall from the person? (the speed of sound in the air is 340 m/s)