In an experiment, the experimental group is:
a. not subjected to experimental error
b. not exposed to experimental treatments
c. maintained under strict laboratory conditions
d. treated exactly the same as the control group, except for one independent variable
e. statistically the most important part of the experiment
d
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A white dwarf whose red giant companion dumps hydrogen onto it may
a. show no effect. b. explode recurrently as a nova. c. blow up as a type I supernova. d. explode recurrently as a nova or blow up as a type Ia supernova.
Single-Slit Diffraction: Light of wavelength 580 nm is incident on a slit of width 0.30 mm. An observing screen is placed 2.0 m past the slit. Find the distance on the screen of the first order dark fringe from the center of the pattern.
A. 0.26 mm B. 1.5 mm C. 1.9 mm D. 3.9 mm E. 7.7 mm
Snell's Law: A light ray in glass arrives at the glass-water interface at an angle of ? = 48° with the normal. The refracted ray in water makes an angle ? = 61° with the normal, as shown in the figure. The index of refraction of water is 1.33. The angle of incidence is now changed to ? = 25°. What is the new angle of refraction ? in the water?
A. 30° B. 56° C. 54° D. 60° E. 62°
What is the direction of 
in the wave as it passes P?
A. A B. B C. C D. D E. Toward the viewer. F. Away from the viewer. T. The vector is zero. G. AA H. BB I. CC J. DD