Sunspots
a. are hotter than their surroundings.
b. are regions where material is rising from below the photosphere.
c. show the Zeeman effect indicating the presence of strong magnetic fields.
d. produce spicules.
e. are generally found near the poles of the Sun during sunspot maximum.
c
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(a) Calculate the shortest wavelength EMR that has high tansmission through CdS. The energy gap in CdS is 2.25 eV. (b) Is a photon with energy 2.26 eV transmitted or absorbed? (c) Is a photon of energy 2.24 eV transmitted or absorbed?
An avalanche of ice and snow of mass 1 500 kg slides a vertical distance of 190 m down a mountainside. If the temperature of the ice, snow, mountain and surrounding air are all at 0°C, what is the change in entropy of the universe?
a. 2.05E+4 J/K b. 1.02E+4 J/K c. 5.12E+3 J/K d. 3.41E+3 J/K e. 1.04E+3 J/K
In 400 B.C., a Greek named ______________ championed the idea that if matter were repeatedly cut into smaller divisions, eventually an indivisible particle would be reached
Fill in the blank(s) with correct word
Vision Problems: Nearsightedness is usually corrected with
A. converging lenses. B. diverging lenses. C. convex mirrors. D. cylindrical lenses. E. concave mirrors.