Having moved away from the Sun and the Earth by half, the nucleus of some comet has weakened its brightness 16 times.

Having moved away from the Sun and the Earth by half, the nucleus of some comet has weakened its brightness 16 times. What proportion of the light emitted by this comet is its own radiation (rays not reflected from the Sun)?

None, since this observed change in brightness reveals the law of inverse proportionality of the square of the distance from the Sun, and this is the law of change in reflected light.

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