Proton
charge +
electron
charge -
neutron
charge neutral
This is the Doppler effect.
1. As the sound leaves the horn the sound waves are at first close to each other and as they move outwards they become further apart. The closer the sound waves are the louder the noise.
As the car gets the closer the sound waves get closer, so the horn becomes louder.
2. As the horn moves away, the sound waves become less frequent, causing the pitch to get lower.
The answer is:
B. <span>X: Work is done to the system and temperature increases.
Y: Work is done by the system and temperature decreases.</span>
I believe it's Mercury, because the only other option would be Pluto and it's not even considered a planet anymore
Hope this helps
C. Insulator
It COULD be semi-insulator but i'm sure its C
