According to the inverse square law of light, how will the apparent brightness of an object change if its distance to us triples?
A. Its apparent brightness will increase by a factor of 9.
B. Its apparent brightness will decrease by a factor of 9.
C. Its apparent brightness will increase by a factor of 3.
D. Its apparent brightness will decrease by a factor of 3.
Answer:B
According to the inverse square law of light, how will the apparent brightness of an object change if its distance to us triples?
A. Its apparent brightness will increase by a factor of 9. B. Its apparent brightness will decrease by a factor of 9. C. Its apparent brightness will increase by a factor of 3. D. Its apparent brightness will decrease by a factor of 3.