The isotope 99m Tc (half-life of 6.0 hours) is used in bone ...

[Beheh]

The isotope 99m Tc (half-life of 6.0 hours) is used in bone scans. How long does it take a quantity of 99m Tc to reduce to 1 of its initial activity?
 
  A)
 
  0.06 hours
  B)
 
  3.3 hours
  C)
 
  33 hours
  D)
 
  40 hours
  E)
 
  slightly more than one month

Question 2

When an LRC series circuit is driven at resonance, which of the following statements about the circuit are correct? (There may be more than one correct choice.)
 
  A) The inductive reactance and the capacitive reactance are both zero.
  B) The impedance of the circuit is zero.
  C) The impedance of the circuit has its minimum value.
  D) The impedance of the circuit has its maximum value.
  E) The inductive reactance and the capacitive reactance are exactly equal to each other.

[reversalruiz]

Answer to Question 1

D

Answer to Question 2

C, E

[Beheh]

Gracias!

[yeungji]

TYSM