Unlike a transverse wave, a longitudinal wave has no
A) amplitude.
B) frequency.
C) wavelength.
D) speed.
E) all of the above
E
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The Sylvania Super Saver 75-W light uses 20 W, produces 1,280 lumens, and costs $4.49. As an alternative, a generic 75-W incandescent light bulb costs $0.40 and produces 1,200 lumens.
a. Compare the performance of each light by calculating the efficacy for each light. b. Estimate how much it would cost to run each light for 4 h per day for 300 days in a year. Assume electricity costs 9 cents per kWh.
In which bioregion does a prolonged summer-season drought bring a unique array of vegetation?
A) Mediterranean B) Tropical Rainforest C) Tropical Savanna D) Steppe E) Deciduous Forests
Which one of the following is a metamorphic rock?
A) limestone B) rhyolite C) slate D) quartz
What is not a characteristic of an El Niño Southern Oscillation (ESNO)?
a. High pressure area shifts to the western Pacific b. Trade winds across the Pacific weaken or reverse directions c. Equatorial currents stop d. Trade winds across the Pacific strengthen