5· The diagram shows a wave at a particular moment in time as it travels along a

Question

5· The diagram shows a wave at a particular moment in time as it travels along a rope in the direction shown Which one of the following statements is true about the point P on the rope? (a) It is moving upwards. (b) It is moving downwards. (c) It is moving to the right. (d) It is momentarily at rest. 6. Two sinusoidal waves travel in the same medium but one with twice the wavelength of the other. Which of the following statements is true? The wave with the longer wavelength has (c) higher frequency (d) lower frequency (a) higher speed (b) lower speed. 7. (crest trough) after When a wave crest is incident upon a free end of a string, it returns as a reflection; therefore, when a trough is incident upon a free end, it must return as a (crest trough) after reflection. a. Crest, crest b. Crest, trough c. Trough, crest d. Trough, trough

Explanation / Answer

Question 12) Given , f = 10 Hz

Time period (T) = 1/f = 1/10 = 0.1 s

Thus , answer) option a) 0.1 s

Question 13) Given , f = 100 Hz , v = 300 m/s

Wavelength = v/f = 300/100 = 3 m

Thus , answer) option b) 3m

Question 9 ) answer) option a) the same

Reason : The speed of the reflected pulse is the same as incident pulse

Question 10) answer) option a) the same

Reason : The wavelength of the reflected pulse is same as the incident pulse

Question 11) answer ) option c) less than

Reason : The amplitude of the reflected pulse is the less than the incident pulse

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