How are distant (young) galaxies different from the galaxies that we see in the universe today?

Athin, square metal plate measures 14 cm on each side and has emissivity of 0.60. the plate is heated to a temperature of 745°c. what is the rate at which the plate radiates energy ? the stefan-boltzmann constant is 5.67 × 10-8 w/(m2 ? k4). remember that the plate will radiate energy from both its top and bottom surfaces.

What happens to the light rays when they hit the specimen?

Argon, neon, and xenon are examples of