Answer:
Scientists believe that light is made of waves because experiments have shown that, based on Huygens's principle, waves have the ability to bend and change direction.
Explanation:
Just as during formation, when the material contracts, the temperature and pressure increase. This newly generated heat temporarily counteracts the force of gravity, and the outer layers of the star are now pushed outward ( in not sure tho ) I hope this helps
Answer:
0.544 eV
Explanation:
To ionize the hydrogen atom 
So the required energy is
as
So 
We have to calculate the energy required to ionize hydrogen atom when it is in n=5
So the energy should be less than 
Answer:
copper
Explanation:
As you can see, out of the more common metals, copper and aluminum have the highest thermal conductivity while steel and bronze have the lowest.