The Compton experiment demonstrated which of the following when an x-ray photon collides with an electron?
a. Momentum is conserved.
b. Energy is conserved.
c. Momentum and energy are both conserved.
d. Wavelength of scattered photon equals that of incident photon.
c
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"Time-of-day" pricing of electricity could help to
A) reduce the need for new power plants by encouraging users to use less electric energy. B) reduce the need for new power plants by encouraging users to use electric energy at less popular times. C) reduce the nation's appetite for chocolate fudge. D) reduce total electric energy use by encouraging users to use electric energy at less popular times. E) reduce total electric energy use by encouraging users to use less electric energy.
Which of the following astronomical objects emit radiation mostly at non-visible wavelengths?
A. cold interstellar gas clouds B. dust clouds in space C. hot gas surrounding black holes D. All of these choices are correct.
An electron is moving with the speed of 1780 m/s
What is its de Broglie wavelength? (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s) A) 409 nm B) 302 nm C) 205 nm D) 420 nm E) 502 nm
The national debt is measured in trillions of dollars. Which of the following is a representation of a trillion?
A) 1 × 1015 B) 1 × 1012 C) 1 × 109 D) 1 × 106 E) 1 × 103