If the frequency of a photon is halved, what happens to its ...

[notis]

If the frequency of a photon is halved, what happens to its energy?
 
  A) It is doubled.
  B) It is halved.
  C) It is tripled.
  D) It is quadrupled.
  E) It is reduced by one-fourth.

Question 2

An assault rifle fires an eight-shot burst in 0.40 s. Each bullet has a mass of 7.5 g and a speed of 300 m/s as it leaves the gun. What is the average recoil force on the gun during that burst?
 
  A) 45 N
  B) 5.6 N
  C) 16 N
  D) 2.0 N
  E) 23 N

[Chou]

Answer to Question 1

B

Answer to Question 2

A