Take the Speed of Sound to Be 340 M/s

question 37

Multiple Choice

Take the speed of sound to be 340 m/s.A thunder clap is heard about 3 s after the lightning is seen.The source of both light and sound is:

• A)moving overhead faster than the speed of sound
• B)emitting a much higher frequency than is heard
• C)emitting a much lower frequency than is heard
• D)about 1000 m away
• E)much more than 1000 m away