Spicules can trigger communications blackouts and auroras on Earth
a. True
b. False
Indicate whether the statement is true or false
False
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If an electron has the same de Broglie wavelength as the wavelength of a 390-nm photon in vacuum,
what is the speed of the electron? (melectron = 9.11 × 10-31 kg, c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s) A) 2100 m/s B) 540 m/s C) 1900 m/s D) 1700m/s E) 1500 m/s
A 200-g metal container, insulated on the outside, holds 100 g of water in thermal equilibrium at
A 21-g ice cube, at the melting point, is dropped into the water, and when thermal equilibrium is reached the temperature is 15.00°C. Assume there is no heat exchange with the surroundings. For water, the specific heat is 4190 J/kg · K and the heat of fusion is 3.34 × 105 J/kg. The specific heat for the metal is closest to A) 3850 J/kg ? K. B) 2730 J/kg ? K. C) 4450 J/kg ? K. D) 4950 J/kg ? K. E) 5450 J/kg ? K.
The distance between peaks on a wave divided by the time for the wave to travel this distance is the wave's
a. speed. b. frequency. c. wavelength. d. amplitude. e. loudness.
Einstein's ________ is a candidate for the dark energy that would be a repulsive force that may exist throughout space, and accelerate the expansion of the universe
Fill in the blank(s) with correct word