Author Question: A solid metal sphere is 15.0 cm in diameter and has surface of uniform color. When its surface is at ... (Read 67 times)

yoroshambo · **on:** Jul 29, 2018

A solid metal sphere is 15.0 cm in diameter and has surface of uniform color. When its surface is at 112C, you measure that it radiates energy at a rate of 71.3 W.

What is the emissivity of the surface of this object? Any heat that enters the sphere from the outside environment is negligible. The Stefan-Boltzmann constant is 5.670 10-8 W/m2 K4.

Question 2

Light from a 600 nm source goes through two slits 0.080 mm apart. What is the angular separation of the two first order maxima occurring on a screen 2.0 m from the slits?

A) 0.15
B) 0.86
C) 0.015
D) 0.0075
E) 1.75