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Writer's picturekeshprad

PhysicsBowl 2016 Q15


15) In this question, we need to find out the wavelength that a radio signal uses to broadcast. We can start with the general wave equation.

Where v is velocity, f is frequency, and λ is wavelength

It is crucial to know the EM spectrum. Radio waves are EM waves, so they travel at speed approximately c ≈ 3*10^8 m/s. It is also important to know the wavelengths on the EM spectrum. A radio wave's wavelength usually has order 10^0, so we can expect a wavelength of this order.

Where v is velocity, c is speed of light, f is frequency, and λ is wavelength

This seems to match our intuition that a radio wave's wavelength would be of order 10^0.


Answer: B

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