Which of these units of temperature is larger?
A) a Celsius degree
B) a Kelvin
C) both are the same size
D) none of the above
Answer: C
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Compton Scattering: A beam of x-rays at a certain wavelength are scattered from a free electron that is at rest, and the scattered beam is observed at 45.0° from the incident beam. What is the change in the wavelength of the x-rays during this process? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 1.75 × 10-13 m B. 2.76 × 10-13 m C. 0 m D. 3.56 × 10-13 m E. 7.10 × 10-13 m
Process of Science: Devise an experiment that would produce evidence (not necessarily proof) that Earth is round. You may use any technology you like, but you may not leave Earth (i.e., no satellite photos and no space travel)
Be as creative as you like there are many right answers.
Take a cup of water, add sugar, and stir. Continue adding sugar and stirring until the sugar crystals no longer dissolve. Then apply heat to dissolve the remaining crystals. If the resulting solution is allowed to slowly cool, the solution is said to be
a. an unsaturated solution. b. a saturated solution. c. a supersaturated solution. d. none of these.
An alternative statement of the uncertainly principle tells us that we cannot know precisely both
A) a particle's mass and energy. B) whether a particle is a wave or whether it is truly a particle. C) a particle's energy and the time during which it has this energy. D) a particle's momentum and its energy.