Introduction to RF Radiation Safety / 2 / 2.7

2.7 REVISION QUESTIONS

1. Write an equation for the sinusoidal voltage waveform as a function of distance traveled.
2. Write an equation for the sinusoidal voltage waveform as a function of the time it has been traveling.
3. Write an equation for the relationship between wavelength and frequency.
4. Sketch a 2-V, 1-kHz sine wave and a 4-V, 10-kHz sine wave in the time domain and the frequency domain.
5. Write an equation for a sinusoidal waveform, including the three wave properties of amplitude, frequency, and phase.
6. List the frequency ranges of the HF, VHF, UHF and SHF frequency bands. Briefly describe the communications uses of each band.
7. List four advantages of digital signals over analog signals.
8. Explain why a perfectly rectangular digital pulse requires infinite bandwidth, and describe the practical consequence of this requirement.
9. Distinguish between the peak, peak-to-peak, RMS, and time-averaged values of an RF signal.
10. A sinusoidal electric field has a peak strength of 100 V/m. Calculate its RMS field strength.
11. Explain why RF exposure averaging is based on squared field values rather than the arithmetic average of the field waveform.