When an electron moves from a lower to a higher energy state, a photon is ________
Fill in the blank(s) with correct word
absorbed
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Which of the following sequences of electromagnetic radiation is correct in order of increasing energy?
a. Gamma rays, X-rays, infrared, radio b. Radio, microwave, gamma rays, UV c. Visible, UV, X-rays, gamma rays d. Visible, microwave, radio, infrared e. Infrared, visible, radio, X-rays
Two plane mirrors make an angle of 50° with one another. A ray of light parallel to mirror #1 reflects off mirror #2 and then strikes mirror #1 . What is the angle of incidence the ray makes with mirror #1?
a. 50° b. The answer is not given. c. 40° d. 55°
A string on a guitar is stretched between two points 30.0 cm apart with a tension of 100 N. The mass/length of the string is 0.00300 kg/m. The velocity of wave propagation on the string is
A. 175 m/s. B. 183 m/s. C. 205 m/s. D. 267 m/s. E. 300 m/s.
The universe was two minutes old when ________ started to form from deuterium fusion
Fill in the blank(s) with correct word