Light from a gas discharge tube gives a (an) ________ spectrum
A) continuous
B) absorption
C) blackbody
D) emission
D
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Various observations suggest there may be recent or even continuing volcanic activity on Venus. Which of the following has NOT been observed?
A) bursts of radio energy, similar to those produced by lightning discharges occurring in the plumes of erupting volcanoes on Earth B) spacecraft detection over a period of days of flowing lava on Venus C) fluctuations in the level of sulfur dioxide in the planet's atmosphere D) surface features resembling rift valleys on Earth E) larger shield volcanoes than Hawaii
A Mack truck and a Mini Cooper traveling at the same speed collide head-on. The collision force is greatest on the
A) Mini Cooper. B) Mack truck. C) same on both
due to the entire loop? 
A. ?0I/4?R B. ?0I/4R C. ?0I/8R D. ?0I/2R E. ?0I/R F. Zero
A sound source emits 20.0 W of acoustical power spread equally in all directions. The threshold of hearing is 1.0 × 10-12 W/m2. What is the sound intensity level 30.0 m from the source?
A) 92.5 dB B) 81.5 dB C) 1.77 × 10-3 dB D) 1.77 × 10-3 W E) -27.5 dB