In pulsed ultrasound, increasing the number of cycles while keeping the same wavelength affects the pulse duration how?

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Multiple Choice

In pulsed ultrasound, increasing the number of cycles while keeping the same wavelength affects the pulse duration how?

Explanation:
Pulse duration is how long the ultrasound pulse lasts in time, and it equals the number of cycles multiplied by the duration of one cycle. With the same wavelength, the cycle duration stays fixed because the frequency f = c/λ is set by the speed of sound c and the wavelength λ. So adding more cycles simply extends the total time the pulse is emitted, making the pulse duration longer. The other possibilities would require changing the cycle length or frequency, which isn’t happening here, so they don’t fit.

Pulse duration is how long the ultrasound pulse lasts in time, and it equals the number of cycles multiplied by the duration of one cycle. With the same wavelength, the cycle duration stays fixed because the frequency f = c/λ is set by the speed of sound c and the wavelength λ. So adding more cycles simply extends the total time the pulse is emitted, making the pulse duration longer. The other possibilities would require changing the cycle length or frequency, which isn’t happening here, so they don’t fit.

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