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Why does the battery in the red Flashflight last so much longer than the blue or green Flashflights? Based on the visible light spectrum within the broader electromagnetic spectrum, we can verify that a longer wavelength is associated with red light than either green or blue light. By definition, wavelength is inversely proportional to frequency. Hence, the frequency is lower for red light than for either green or blue light. This low frequency means less energy is required to produce this color of light (red) than either green or blue light. The Flashflight disc carrying the red LED then has a battery life that is greater than either the green or blue carriers. To underscore this point, the Flashflight disc carrying the red LED includes one 3V battery to achieve its 120 hour "light life" whereas the green and blue include two 3V batteries each to achieve the 25 hour "light life". |
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