Ok, let me see if I can help
Sound is caused by vibrations. These can pass through a solid, liquid, and gas. But not through vacuum because there are no particles
Answer:
C
Explanation:
The pattern is adding .5 to the cm every .1 in weight you just continue the table
Voltage = current x resistance
since R is doubled, current must reduce by half.
So,
new current = 120/2 = 60mA