Author Question: If someone were to suggest that possibly half of the galaxies in the universe are composed of ... (Read 26 times)

maegan_martin · **on:** Jul 27, 2018

If someone were to suggest that possibly half of the galaxies in the universe are composed of antiparticles (anti-galaxies), what argument(s) might you present to refute this hypothesis?

(Remember, atoms made of antiparticles have the same chemical and spectroscopic properties that our ordinary matter has.)

Question 2

The condition for total internal reflection can be predicted from Snell's law since

A) the index of refraction of glass is about 1.5.
B) the index of refraction of plastic is about 1.5.
C) the value of tangent can be 1.0.
D) the maximum value of the sine is 1.0.
E) the maximum value of the sine is 1.5.

lorealeza77 · **Reply #1 on:** Jul 27, 2018

Answer to Question 1

Astronomers see many galaxies colliding, and if a pair were composed of a galaxy and an antigalaxy, then ENORMOUS high energy radiation would escape (be seen) due to the particle-antiparticle annihilations.

Answer to Question 2

D