An eroded surface of metamorphic rocks on which a horizontal bed rests is called a
A) strata.
B) dike.
C) nonuniform surface.
D) nonconformity.
Answer: D
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A _____ is an electronic device consisting of a large array of light-sensitive elements used to record very faint images
A) photometer B) charge-coupled device C) spectrograph D) photographic plate
Two electrons are placed into separate (very tiny) one-dimensional boxes A and B. When the electrons are excited to higher energy levels and then decay to lower levels, they emit photons. The longest-wavelength spectral line from the electron in box A is observed to have the same wavelength as the third-longest spectral line from the electron in box B. The ratio of the box lengths LA/LB is equal to
A. 3/7
B. 7/3
C. 
D. 
E. 9/49
The characteristic rotational energy, h2/8?2I, for O2 is 2.9 × 10-23 J. Calculate the O2 bond length
A) 3.6 × 10-10 m B) 0.60 × 10-11 m C) 1.2 × 10-10 m D) 0.30 × 10-11 m E) 2.4 × 10-10 m
A convex mirror with focal length of -20 cm forms an image 15 cm behind the surface. Where is the object located as measured from the surface?
a. 30 cm c. 15 cm b. 7.5 cm d. 60 cm