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It is hard to get a feeling of the concepts of power and energy. To understand this better, let us look at the power and energy generated by the human body. In 1994, the Spanish cyclist Miguel Indurain set a world hour record of 53040 meters in 1 hour. Spanish scientists measured an average power of 509.5 watts produced by him during that hour. What is the energy generated by him in that hour expressed in kWh? ______

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How many million joules \((MJ)\) is equivalent to \(2.5\) kWh? ______

Let's assume that solar light reaches a silicon solar cell with an angle of incidence of \(\theta_i=0^o\). For simplicity, let's consider the refractive index of silicon to be \(n_{Si}=3.5\). The refractive index of air is \(n_{air}=1\). What percentage of light would be lost due to reflection at the air-silicon interface? Assume that the solar light is randomly polarized. ______

The thickness \(d\) (in \(\mu m\)) required to achieve a light absorption of 90% for Si is: ______

The thickness \(d\) (in \(\mu m\)) required to achieve a light absorption of 90% for Ge is: ______

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