1. The amplitude of the current oscillation in the antenna is decreased. How doe

Question

1. The amplitude of the current oscillation in the antenna is decreased. How does that affect the EM wave coming past me 2000m away.

A) The wave travels past me at lower speed

B) The amplitude of the electric field oscillation in the wave decreases

C) The wave oscillates at a lower frequency

D) A and B

E) A, B and C

2. The amplitude of the current oscillation in the antenna is dereased. How does that affect the motion of electrons in a receiving antenna a mile away?
A)   
They oscillate at a lower frequency
B)   
The oscillate with a shorter period
C)   
They oscillate with a lower amplitude  
D)   
A and B  
E)   
A, B and C

Explanation / Answer

1) All EM waves travel with speed of light so speed cannot be less than zero The electric field amplitude decreases with decrease in current in the antenna but frequency increases.

2) The electrons received would have a increased frequency or shorter time period with same speed of light. The wavelength is reduced as frequency is increased.

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