Sunspots are known to be magnetic phenomena because
a. Doppler shifts in spectral lines are observed.
b. the Zeeman effect is observed in sunspots.
c. collisional broadening is observed in spectral lines.
d. infrared observations indicate that the sunspots are cooler than their surroundings.
e. observations during eclipses reveal a very extensive photosphere.
b
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Metal alloys dispersion strengthened with oxide particles are usually produced by _________metallurgy techniques.
Fill in the blank(s) with the appropriate word(s).
A constant force is acting on an object. Which of these graphs best represents the acceleration of the object?
A. 
B. 
C. 
Monochromatic light of wavelength 500 nm is incident normally on a diffraction grating. If the third-order maximum of the diffraction pattern is observed at 32.0° from the central spot, how many TOTAL number of maxima can be seen?
A) 5 B) 7 C) 10 D) 11 E) 13
Compared to its neutral atom, an ion has the same number of
A) protons and neutrons B) protons but a different number of neutrons C) protons but a different number of electrons D) neutrons but a different number of protons