A uniformly charged rod (length = 2.0 m, charge per unit length = 5.0 nC/m) is bent to form one quadrant of a circle. What is the magnitude of the electric field at the center of the circle?
a. 62 N/C
b. 56 N/C
c. 50 N/C
d. 44 N/C
e. 25 N/C
c
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Molecular oxygen is composed of two oxygen atoms that share four electrons. How many covalent bonds exist between the two oxygen atoms?
a. none b. one c. two d. four e. eight
Name the three main types of active galaxies.
A. Seyfert, radio, and quasar B. spiral, elliptical, and irregular C. barred spiral, irregular, and Seyfert D. old, young, and intermediate
Which of the following has the largest luminosity?
A: coolest Main Sequence star B: Main Sequence star with the smallest radius C: Main Sequence star with spectral type K D: most massive Main Sequence star E: the Sun
X-rays, because they have more energy, travel through space faster than visible light
Indicate whether the statement is true or false