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Speed of Light

Saafa asked:

“what is the speed of light?”

Ans:

Speed of Light in Vacuum is 3 x 108 m/s

The various experiments conducted to determine the speed of light are

  • [wiki]Foucault[/wiki]’s method
  • [wiki]Fizeau[/wiki]’s method
  • [wiki]Michelson[/wiki]’s method
  • … and many more

Formation of Beats

Abhay asks:

“What is meant by beats?discuss graphical method for formation of standing waves on streched strings?”

Answer:

Beats are periodic variation in intensity of sound caused by the superposition of two waves slightly differing in their frequencies. Beats are heard when the difference in frequency is less than 10. (because human ear can distinguish two sounds distinctly only if they differ in time by 0.1 sec.)
Here are some links to understand beats better through interactive animations

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