What is the focal length of a contact lens that will allow a ...

[RYAN BANYAN]

What is the focal length of a contact lens that will allow a person with a near point of 125 cm to read a physics book held 25.0 cm from his eyes?
 
  A) -100 cm
  B) -31.3 cm
  C) 10.2 cm
  D) 20.8 cm
  E) 31.3 cm

Question 2

The radioactive nuclei 60Co is widely used in medical applications. It undergoes beta decay, and the total energy of the decay process is 2.82 MeV per decay event. The half-life of this nucleus is 272 days.
 
  Suppose that a patient is given a dose of 6.9 Ci of 60Co If all of this material decayed while in the patient's body, what would be the total energy deposited there? (1 Ci = 3.70  1010 decays/s) A) 11 J
  B) 8.6 GJ
  C) 3.9 J
  D) 24 J
  E) 4.15 MJ

[kaylee05]

Answer to Question 1

E

Answer to Question 2

C

[RYAN BANYAN]

Excellent

[momolu]

TYSM