In the name of ALLAH, the most beneficient, the most merciful

Physics (PHY101)

Question (select most suitable option)

  Take the speed of sound to be 340m/s. A thunder clap is heard about 3 s after the lightning is seen. The source of both light and sound is:
moving overhead faster than the speed of sound
emitting a much higher frequency than is heard
emitting a much lower frequency than is heard
about 1000m away