The scientist who discovered X-rays is MCQ with Answer and Explanation

Explanation:
Visible spectrum approx 400 nm (violet) to 700 nm (red).

Explanation:
When light travels from an optically denser medium to a rarer medium, it bends away from the normal. As the angle of incidence increases, the angle of refraction also increases. The specific angle of incidence for which the refracted ray grazes the surface (meaning the angle of refraction is exactly 90 degrees) is defined as the critical angle.

Explanation:
Kepler's 3rd law: T² ∝ R³ => T' = T (4)^(3/2) = T×8 = 8T.