To calculate the frequency of a wave given its wavelength, we can use the equation:
f = v / λ
where: f is the frequency of the wave, v is the velocity of the wave (speed of light in a vacuum), and λ is the wavelength of the wave.
The speed of light in a vacuum is approximately 3.00 x 10^8 meters per second (m/s).
Substituting the given values into the equation:
f = (3.00 x 10^8 m/s) / 2.75 m
f ≈ 1.09 x 10^8 Hz
Therefore, the frequency of a microwave with a wavelength of 2.75 m is approximately 1.09 x 10^8 Hz (hertz).