1. The distance traveled by a wave in one period is called? A. Frequency В. Period C. Speed of wave D. Wavelength E. Amplitude 2. The frequency of a wave is doubled when the wavelength remains the same. What happens to the speed of the wave? A. It doubles B. It quadruples E. It is cut to one-fourth C. Remains unchanged D. It is cut to one-half 3. The frequency of a wave increases when the speed remains the same. What happens to the distance between two consecutive crests? C. Stays unchanged D. It increases first and then decreases A. It increases B. It decreases E. It decreases first and then increases 4. A stretched string of length L= 2 m resonates in two loops. What is the wavelength of the wave? С. 3 m A. 1m B. 2 m D. 4 m E. 6 m 5. A stretched string of length 8 m vibrates at a frequency of 50 Hz producing a standing wave Pattern with 4 loops. What is the speed of wave? L A. 50 m/s B. 100 m/s C. 150 m/s D. 200 m/s E. 250 m/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.