How many electrons are in chromium's (atomic number 24) next to outer shell (n = 3)?
a. 1
b. 14
c. 12
d. 13
e. 8
d
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A plot of the continuous spectra of five different stars is shown in the figure. Based on these spectra, which of the stars is the hottest?
a. Star A
b. Star B
c. Star C
d. Star D
e. Star E
The main ingredients of most satellites of the jovian planets are
a. rock and metal. b. hydrogen compound ices. c. hydrogen and helium.
At t = 0, a particle is located at x = 25 m and has a velocity of 15 m/s in the positive x direction. The acceleration of the particle varies with time as shown in the diagram. What is the velocity of the particle at t = 5.0 s?
?
?
A. +15 m/s B. ?15 m/s C. +30 m/s D. 0 E. ?1.2 m/s
A single slit of width a is illuminated by light of wavelength ?. If a = 4.3?, the maximum number of dark fringes on a semi-circular screen surrounding the slit is
A. 2. B. 4. C. 6. D. 8. E. 9.