C. The forces on an object traveling at terminal velocity are balanced.
The drop of purple food dye will sink to the bottom while expanding around the cup turning the water purple
Answer:
The fractional Intensity
= 0.0146
Given:
wavelength of the light, 
slit and screen separation difference, D = 130 cm = 1.3 m
distance of the point from the center of the principal maximum, y = 4.10 mm = 0.041 m
slit width, d = 0.420 mm = 
Solution:
To calculate the fractional intensity, we use the given formula:
(1)
For very small angle:
(2)
where


Using eqn (2):

Now, using eqn (1):

Hope this answer helps, cause Idk, I might be wrong, but I still, I used the correct formulas, so I might be correct
It is more likely to be a metal. This is because metals are good heat conductors whereas non metals tend to be poor heat conductors.