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1.2 Whiz Quiz Answers
  1. The most obvious source of electromagnetic energy and radiation is the sun. The sun provides the initial energy source for much of the remote sensing of the Earth surface. The remote sensing device that we humans use to detect radiation from the sun is our eyes. Yes, they can be considered remote sensors - and very good ones - as they detect the visible light from the sun, which allows us to see. There are other types of light which are invisible to us...but more about that later.

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  2. Using the equation for the relationship between wavelength and frequency, let's calculate the wavelength of radiation of a frequency of 500,000 GHz.

    Whiz Quiz Answer Equations

    Since micrometres (mm) are equal to 10-6 m, we divide this by 1x10-6 to get 0.6 mm as the answer. This happens to correspond to the wavelength of light that we see as the colour orange. We will learn more about wavelengths and what we call colour in the next section.

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