Colors seen on TV result from color
A) addition.
B) subtraction.
C) either of these
D) none of the above
Answer: A
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Calculate (0.83 + 0.049)(4.4 × 10^3), keeping only significant figures
a. 3 900 b. 3 868 c. 3 886 d. 3 644 e. 4 000
Matter Waves: If the wavelength of a photon in vacuum is the same as the de Broglie wavelength of an electron, which one is traveling faster through space?
A. The electron because it has more mass. B. The photon because photons always travel through space faster than electrons. C. They both have the same speed.
A stream of a certain liquid compound is not attracted to an electrically charged rod. The compound is probably
a. metallic. b. ionic. c. nonpolar covalent. d. polar covalent.
A wave moves in a rope with a certain wavelength. A second wave is made to move in the same rope with twice the wavelength of the first wave. The frequency of the second wave is _________ times the frequency of the first wave
Fill in the blank(s) with correct word