How do we know there was a big bang?
What will be an ideal response?
The gases in the Universe right after the big bang would have been hot and should have emitted strong blackbody radiation. The large redshift of the big bang material relative to Earth would lengthen the wavelengths of that radiation into the microwave part of the spectrum. It is accepted that the cosmic microwave background radiation is the radiation from the big bang.
You might also like to view...
Tensile Stress and Strain: A 25-kg piece of equipment can be hung by steel wires of length 1.00 m, 2.00 m, or 3.00 m. If all the wires have the same diameter, which one will stretch the greatest percent?
A. the 1.00-m wire B. the 2.00-m wire C. the 3.00-m wire D. They will all stretch by the same percent.
Estimate how many textbooks of 1000 pages stacked on top of each other would make a stack of books 10 feet high.
A. 60 B. 50 C. 40 D. 30 E. 20
Which situation has the least magnitude of angular momentum about the origin?
A. A 2 kg mass travels along the line y = 3 m with speed 1.5 m/s. B. A 1 kg mass travels in a circle of r = 4.5 m about the origin with speed 2 m/s. C. A disk with I = 3 kg·m2 rotates about its center (on origin) with ? = 3 rad/s.
1.A 2.B 3.C 4.Both A and B 5.Both A and C 6.Both B and C 7.All have the same magnitude angular momentumThe color charge of leptons is
A) violet. B) red. C) blue. D) zero. E) green.