Amirror will reflect a. all wave lengths of visible light that will shine on it b. some wavelengths of visible light that will shine on it c. none of the wavelengths of visable light that will shine on it d. only the visible light that slows down enough to be reflected.

A mirror will reflect B. Some wavelengths of visible light that will shine on it. Every matter absorbs light in certain wavelength. The wavelength is absorbed by the molecules that make up the matter. The wavelengths of light that do not get absorbed are reflected back. As with mirror, it has a narrow absorption band for the wavelengths of light in visible spectrum (graph shows that silver mirror has 85% reflectance in the visible spectrum). Hence it appears to us that all of the visible light gets reflected.

1) a

2)c

3)a

4)c

5)b

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the energy generated by an individual's metabolism is calculated in met (metabolic equivalent of task). the met is the ratio of the work metabolic rate to the resting metabolic rate. one met is illustrated as 1 kcal per kilogram per hour, and is probably equal to the energy cost of sitting quietly.

1 met is equal to 1.162 watt per kg

1 kg is equal to 1000 grams

as the person weighs 80000 gm, that is, 80 kg.

therefore, 80*1.162 = 92.96

thus, the person expends 92.96 watts of power while at rest.