Uranus appears blue to us because blue photons are absorbed into the atmosphere
a. True
b. False
Indicate whether the statement is true or false
False
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Considering only the effect of diffraction, what is the smallest structure resolvable using a 12keV electron microscope?
a. 
b. 
c. 
d. 
An electron in a TV picture tube is accelerated through a potential difference of 10 kV before it hits the screen. What is the kinetic energy of the electron in electron volts? (1 eV = 1.6 × 10^?19 J)
a. 1.0E+4 eV b. 1.6E–18 eV c. 1.6E–11 eV d. 6.3E+22 eV e. 2.6E–15 eV
A solid nonconducting sphere of radius R carries a uniform charge density throughout its volume. At a radial distance r1 = R/4 from the center, the electric field has a magnitude E0. What is the magnitude of the electric field at a radial distance r2 = 2R?
A) E0/4 B) zero C) E0/2 D) E0 E) 2E0
Spherical Mirrors: Suppose you place an object in front of a concave mirror. Which of the following statements must be true? (There could be more than one correct choice.)
A. The image of the object will always be smaller than the object. B. No matter where you place the object, a real image of the object will be formed. C. The image of the object will always be inverted. D. If you position the object between the mirror and the focal point of the mirror, its image must be upright and virtual. E. No matter where you place the object, the image of the object will always be virtual and upright.