What is the main evidence for the Big Bang theory?
The main evidence that we currently have to support the Big Bang Theory is the cosmic background radiation. This is electromagnetic radiation that appears to be evenly spread throughout the universe. It is mostly in the microwave spectrum, equating to a temperature of about 3K. This suggests that the universe was once very hot and compressed, and as the universe has expanded, the once very high energy, short wavelength radiation has red-shifted to lower energy, longer wavelength microwave radiation.
SE
Related Physics A Level answers
All answers ▸Derive the formula for the maximum kinetic energy of an electron emitted from a metal with work function energy p , that is illuminated by light of frequency f.
the moon takes 27.3 days (2.36x10^6s) to orbit the earth . Calculate its distance from the earth . Take the mass of the earth to be 5.975x10^24kg.
How would you prove the formula for the total capacitance of a system consisting of several capacitors linked in series?
a solar cell of area 2m^2 has maximum a power output per unit area of 20W/m^2 . if four solar cells are used together at once, how much energy is release in 2 mins at max power output?