When a cell phone is used in the elevator, why is the signal weak or not in service?
a. The elevator is closed
b. EM wave are absorbed or reflected
c. EM wave is strong
d. The elevator is moving
Answer: b
When a cell phone is used in the elevator, why is the signal weak or not in service?
a. The elevator is closed
b. EM wave are absorbed or reflected
c. EM wave is strong
d. The elevator is moving
Answer: b