Intensity of Sound: What is the intensity level in decibels of a sound with intensity 10-3 W/m2? The threshold of human hearing is 1.0 × 10-12 W/m2.
A. 30 dB
B. 60 dB
C. 90 dB
D. 96 dB
Answer: C
Physics & Space Science
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Charge of uniform density (40 pC/m2) is distributed on a spherical surface (radius = 1.0 cm), and a second concentric spherical surface (radius = 3.0 cm) carries a uniform charge density of 60 pC/m2 . What is the magnitude of the electric field at a point 2.0 cm from the center of the two surfaces?
a. 1.1 N/C b. 4.5 N/C c. 1.4 N/C d. 5.6 N/C e. 0.50 N/C
Physics & Space Science
When you sit by a campfire, by what method of heat transfer are you primarily being warmed?
What will be an ideal response?
Physics & Space Science
Dark energy accounts for what percent of the known energy in the universe?
A) 68% B) 24% C) 8% D) 94%
Physics & Space Science