Sound Waves:
require a medium to travel
longitudinal waves
waves from a speaker
Electromagnetic Waves:
do not require a medium to travel
transverse waves
gamma rays
C. Falling unstable air forms a cold airmass
200N is the answer (at least thats what I think)
1. V = IR
You rearrange it to make I the subject by dividing both sides by R. You get:
I = V / R
I = 10 / 50
= 0.2 A
2. Q = It
Charge = 0.2 x 2
Charge = 0.4 C