What effect does increasing frequency of a transducer have on propagation speed?

• A. It increases
• B. It decreases
• C. It remains the same
• D. It fluctuates

Answer: (C)

The propagation speed of a wave through a medium is determined primarily by the physical properties of that medium, such as its density and elasticity. In this context, the frequency of a transducer relates to how often it emits sound waves, but it does not influence the speed at which these waves travel through the medium.

When a transducer increases its frequency, the wavelength of the emitted sound waves decreases, since wavelength is inversely related to frequency for a given speed. However, regardless of frequency, the speed of sound in a particular medium remains constant as long as the medium's conditions (like temperature and pressure) do not change. Therefore, increasing the frequency doesn't affect the sound's propagation speed; it remains constant in a specific medium.

Consequently, the choice that accurately reflects the relationship between frequency and propagation speed in a medium is that it remains the same.