The answer should be D) Cold air because even though its true sound can travel through all types of matter, air which is a gas, can travel but it travels SLOWLY while sound travels quickly in SOLIDS.
Base in your questions that ask what cause the bright lines seen in the emission spectrum and i think the best answer to that is the H2 gas is used when protons was heated so the electron absorb all the photons and get exited and resulted by given of a light.
Answer:
The object on earth, because earth has a bigger amount of gravity than how much the moon has.
Explanation:
Answer:
D
Explanation:
because two vectors which align in the same line adds one to another
