Answer:
answer c: a mass and volume
Explanation:
no matter what elements are chosen, they all have a mass and volume measurement I believe
I think it's longitudinal wave because the particles move parallel to the direction that the wave is traveling.
Answer:
Angle of incidence = 20°
Angle of reflection = 20°
Explanation:
Applying,
The first Law of Refraction: The incident ray, the reflected ray and the normal at the point of incidence all lies in the plane.
From the diagram,
Angle of incidence = 90-70
Angle of incidence = 20°
From the law of reflection,
Angle of incidence = Angle of reflection
Therefore,
Angle of reflection = 20°
False. They are arranged in a structure called a crystal lattice