When light travelling in air passes into a sheet of glass, it is observed to change in wavelength to 58% of its wavelength in air. What is the speed of light in the glass?
A. 5.2 x 
m/s
B. 1.7 x
m/s
C. 3.0 x
m/s
D. 2.3 x
m/s
B. 1.7 x
m/s
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Spiral arms appear bright because ________
A) they contain far more stars than other parts of the galactic disk B) they are the only places where we find stars within the disk of the galaxy C) they contain more molecular clouds than other parts of the disk D) they contain more hot young stars than other parts of the disk
Spherical Mirrors: An object is placed 50 cm in front of a concave mirror with a focal length of 25 cm. What is the magnification produced by the mirror?
A. -0.50 B. -1.0 C. +1.5 D. -2.0 E. +1.0
Exhibit 5-2
A 4.00-kg block is suspended from the roof of an elevator. A 2.00-kg block is suspended from the 4.00-kg block. The tensions in strings 1 and 2 are labeled 
and 
.
?
?
Use this exhibit to answer the following question(s).
Refer to . When the elevator accelerates downwards with an acceleration of 2.20 m/s2, the magnitudes of 
and 
are
A. 30.4 N; 15.2 N.
B. 39.2 N; 19.6 N.
C. 45.6 N; 15.2 N.
D. 48.0 N; 24.0 N.
E. 72.0 N; 24.0 N.
A single slit forms a diffraction pattern with monochromatic light. The 4th minimum of the pattern occurs at an angle of 35° from the central maximum. How many bright bands are on each side of the central maximum?
A) 5 B) 4 C) 6 D) 7 E) 8