The kinetic energy of an electron in a Bohr orbit of the hydrogen ...

[jace]

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

[shayla]

Answer to Question 1

A

Answer to Question 2

TRUE

[jace]

TYSM

[okolip]

Excellent