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Question 8 Two waves with identical frequency f and amplitude A are superimposed on each other. The waves are partially out of phase (one is shifted by 1/4 wavelength compared to the other). The resultant wave will have: Select the correct answer O Frequency less than f, amplitude equal to 2A O Amplitude exacly equal to 0 O Frequency equal to f,amplitude less than 2A O Frequency equal to f, amplitude equal to 2A Frequency less than f, less than 2A Your Answer

A guitar string is fixed at both ends.

What other change could double the fundamental frequency? (Changing length in this case refers to moving the fixed point to a different position of the string, perhaps by putting down a finger on the guitar string). Select the correct answer O None of these options would double the fundamental frequency? O Decrease the string length by a factor of 2 O Decrease the string length by a factor of 4. increase the string length by a factor of 2 Pr Your Answer O Increase the string length by a factor of 4.

Which of the above would double the wavelength of the fundamental resonant mode on the string? Select the correct answer None of these options would double the wavelength of the fundamental mode. Decrease the linear mass density by a factor ofo Answer O Decrease the linear mass density by a factor of 4 O Increase the linear mass density by a factor of 2 O Increase the linear mass density by a factor of 4

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