Currently, in the United States, which sector of the economy uses the most energy?
a. Industry
b. Transportation
c. Commercial
d. Residential
a
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An electron and a positron annihilate each other, emitting two identical photons in the process. What is the wavelength of these photons? The mass of an electron or positron is 9.11 × 10-31 kg and h = 6.63 × 10-34 Js
A) 1.21 × 10-12 m B) 1.73 × 10-12 m C) 2.43 × 10-12 m D) 3.07 × 10-12 m E) 3.46 × 10-12 m
Briefly describe the Sun's 22 year activity cycle
What will be an ideal response?
What is the main difference between a soap and a detergent?
A) Soaps are made from fatty acids, detergents are synthetic. B) Soaps are biodegradable, detergents are not. C) Detergents are better than soaps. D) Soaps are all natural. E) Soaps and detergents are exactly the same.
A ____ is believed to occur when energy, stored in a twist in the solar magnetic field above a sunspot, is suddenly released
a. solar flare b. supergranule c. spicule d. coronal hole e. none of the above