Homework Help: Physics

Posted by Derp on Friday, October 19, 2012 at 12:50pm.

When a torch is brought 2 times closer, how many times brighter will it appear?

2

4

9

16

At first, I figured the answer would be the obvious (2), but then I second-guessed myself and figured 4

Physics - Anonymous, Friday, October 19, 2012 at 1:04pm
I think the answer is 4. The brightness is a function of the distance squared.

Answer this Question

Related Questions

Math,help - how do i evalute this problem if possible. i will decribe it it has ...
Physics - If a ball is thrown directly upwards with twice the initial speed of ...
Math - decide how many times out of 20 tosses you would expect heads to appear ...
Math - Can you see if my answers are correct? Directions find the GCF: (I did ...
GCF Math Check - Can you see if my answers are correct? Directions find the GCF...
Science - Planets shine by reflected sunlight. How can planets be brighter than ...
Science need help - Astronomers believe that the biggest stars in the Galaxy may...
geometry - The lengths of the sides of a rectangle become 4 times greater than ...
Chemistry - for each of the following, give an answer with the correct number of...
Math - Can I reduce these fractions before I multiply them together? because ...

For Further Reading

First Name:
School Subject:
Answer: