5.0 m - Figure P12.40 shows an experiment in which sound waves generated by a singer and having a single frequency are emitted by two speakers. These sound waves interfere at a listener located at point P. If the interference at P is constructive, what is a pos- sible value of the frequency? gri P 30° hel S

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Relativistic Energy and Momentum

According to classical physics, time flow is the same for every observer. But according to einstein's theory, time flow is different for different observers. The idea that time flow is not the same for all may sound strange because we may not experience this effect in everyday life. This effect is only observed when an object moves with some velocity comparable to the velocity of light. This velocity is termed relativistic velocity.