The closest star to the Sun is about how far away?
a. 17.7 light-years
b. 0.52 light-years
c. 33.6 light-years
d. 4.3 light-years
d
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In an isochoric process, the internal energy of a system decreases by 50J. What is the work done?
A. zero B. +50 J C. -50 J D. none of the above
A polarizer is oriented at an angle ? to the vertical. If the vertically polarized beam of light of intensity 200 W/ m2 passes through the polarizer, find the transmitted intensity of light for an angle of 90.0°
A) 0 W/m2 B) 50.0 W/m2 C) 400 W/m2 D) 100 W/m2 E) 200 W/m2
A Geiger counter placed 1 meter from a point source of radiation registers 100 counts per minute. If the Geiger counter is moved closer, half-way to the source, the counting rate will be
A) 25 counts/min. B) 50 counts/min. C) 100 counts/min. D) 200 counts/min. E) 400 counts/min.
What is the magnitude of the electric field 2.8 cm from a tiny object that carries an excess charge of –16 nC? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 180,000 N/C B) 5100 N/C C) 1.8 × 1014 N/C D) -180,000 N/C E) -5100 N/C