tnen increases the rate to three times back and forth each second. At the increa
ID: 2303809 • Letter: T
Question
tnen increases the rate to three times back and forth each second. At the increased rate, which of the following statements is true? . A student is making a wave in a spring by moving her hand back and forth two times each second. She A) The velocity of the wave also increases. B) The wavelength of the wave also increases. C) The frequency of the wave stays the same D) The velocity of the wave stays the same. 29 . Two sinusoidal functions of time are combined to obtain the result shown in the figure shown. Which of the following can best be explained by using this figure? Displacement Time A) Beats B) Doppler effect C) Diffraction D) Polarization A small vibrating object on the surface of a ripple tank is the source of waves of frequency 20 Hz and speed 60 cm/s. If the source S is moving to the right as shown in the diagram with speed 20 cm/s, at which of the labeled points will the frequency measured by a stationary observer be greatest? 20. A) A ?) ? C) C D) DExplanation / Answer
28. The velocity of the wave depends on the properties of the spring. It remains same. By moving her hand faster, she is increasing the frequency. SO (d) is the correct option.
29. When two wave supperpose, they produces standing waves, or beats.
30. The circles are the wavefronts. The distance between two such wavefronts is wavelength. We have to look for short wavelengths which corresponds to higher frequency. Clearly, C is the point where the wavelength is minimum, hence frequency is maximum.
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