Suppose you see two stars that have the same apparent magnitude if one star is actually four times as far away as the other how much brighter would be the farther star really be?

Which notation is used to represent an alpha particle? a. b. c. d.

In a good thermo flask the main cause of heat loss is

Exercise 2. find the wavelength of a photon emitted when an electron jumps from the n = 3 energy level down to the n = 2 energy level. where is this photon in the electromagnetic spectrum?