Gamma rays can penetrate A) air only. B) a piece of ...

[JGIBBSON]

Gamma rays can penetrate
 
  A)
 
  air only.
  B)
 
  a piece of paper.
  C)
 
  several millimeters of aluminum.
  D)
 
  several centimeters of lead.
  E)
 
  several meters of iron.

Question 2

In hydrogen any transition ending in the ground state emits a photon that
 
  A)
 
  may be in the ultraviolet.
  B)
 
  is in neither the ultraviolet nor the infrared.
  C)
 
  may be in the infrared.
  D)
 
  is in the infrared.
  E)
 
  is in the ultraviolet.

[cloud]

Answer to Question 1

D

Answer to Question 2

E

[JGIBBSON]

Excellent

[scottmt]

Thanks for the timely response, appreciate it