Question

Science Help needed! PLEASE?

1. Which of the following is true about all electromagnetic waves in a vacuum?

A) they all carry the same energy
B) they all travel at the same speed
C) they all have the same frequency
D) they all have the same wavelength

2. FM signals travel as changes in

A) the speed of the wave
B) the amplitude of the wave
C) the frequency of the wave
D) the loudness of the wave

3. What is the principle role of a tower within a cellular system?

A) to track data usage
B) to transmit signals
C) to pinpoint locations
D) to reduce line noise

Answer 1

Hi! I'm going to bed in a moment. But.. Can you start by elimination?