Answer:
an astronomer studies planets, stars, moons, etc, or objects that are outside the field of Earth.
I'll put my answer in the comments but, part of the question is cut off do you mind putting a more readable and not sideways picture?
Answer:
Explanation:
Energy, as we have noted, is conserved, making it one of the most important physical quantities in nature. The law of conservation of energy can be stated as follows: Total energy is constant in any process. It may change in form or be transferred from one system to another, but the total remains the same.
C and E Gravitational and Chemical energy
Answer:
Explanation:
This is a case of interference of sound , akin to YDSE in optics .
Here, like interference dark and bright fringes, region of silence and intense sound will be formed due to destructive and constructive interference respectively.
Here d = distance between two sources = 5 m
D = distance of source and screen = 12m
position of first destructive interference
= λ D /2d
1 = λ 12 /2x 5
λ = 5 / 6 m
frequency = v / λ
= 343 x 6/ 5
= 411.6 Hz
