The kinetic energy of an electron in a Bohr orbit of the hydrogen atom is 8.57 10-20 J. What is the radius of the orbit?
A) 1.35 10-9 m
B) 2.01 10-9 m
C) 2.64 10-9 m
D) 4.12 10-9 m
E) 5.29 10-11 m
Question 2
The focal length of the objective of a telescope is much longer than the focal length of the eyepiece.
Indicate whether the statement is true or false