Dan confirms the authenticity of an amethyst stone by a few tests. During one of the tests, he finds the angle of the refracted ray of light coming out of the amethyst Into the air as 28°. If the refractive Index of amethyst is 1.55, what is the incident angle?
OA.
152°
OB. 26°
OC. 47°
D. 72°

Give one example to show that when substances are mixed, it may result in a chemical or a physical change depending on the conditions.

Due sun 06/09/2019 11: 59 pm skip navigation questions correct q 1 [1/1] correct q 2 [1/1] correct q 3 [1/1] untried q 4 (0/1) untried q 5 (0/1) untried q 6 (0/1) untried q 7 (0/1) untried q 8 (0/1) untried q 9 (0/1) untried q 10 (0/1) grade: 3/10 print version start of questions two cyclists, 42 miles apart, start riding toward each other at the same time. one cycles 2 times as fast as the other. if they meet 2 hours later, what is the speed (in mi/h) of the faster cyclist?

Identify some abiotic characteristics of the tundra biome.