Answer :
Final answer:
The decrease in a flashlight's brightness as it moves away is due to the 'Inverse Square Law for Light.' As light moves away from its source, it spreads across a larger area, reducing the energy per unit area, which correlates to decreased brightness. Thus, an object appears less bright as the distance between it and the observer increases.
Explanation:
The decrease in brightness of a flashlight as it moves farther away is due to a principle in physics known as the Inverse Square Law for Light. This law indicates that as light travels from its source, it must cover an increasingly larger area, resulting in the light being spread out. The amount of energy per unit area (which corresponds to the perceived brightness) thus decreases with the square of the distance from the source. Basically, if we double the distance from the source, we receive four times less light (as 2 squared is 4), and if we increase the distance ten times, we get 100 times less light (as 10 squared is 100).
For instance, assume a scenario where a star emits the same total energy as the sun but is located 270,000 times farther from us. Consequently, the star would appear approximately 73 billion times fainter! Thus, even the brightest objects, with the same intrinsic brightness, will appear less bright as the distance between the observer and the source increases.
The contrast in brightness for objects moving further away from the observer is why stars appear as faint pinpoints of light from Earth, rather than the bright luminous bodies they are.
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The farther you get away from the object the bigger the surface it covers. And the farther you get away the dimmer it will be.
