A certain part of the electromagnetic spectrum ranges from 200 nm to 400 nm. What is the lowest frequency associated with this portion of the spectrum? (c = 3.00 × 108 m/s)
A) 1.50 × 1014 Hz
B) 7.50 × 1013 Hz
C) 1.50 × 1015 Hz
D) 7.50 × 1015 Hz
E) 7.50 × 1014 Hz
E
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A molecule takes 3.0 seconds to diffuse across a membrane. If the thickness of the membrane is doubled, then how long does it take the molecule to diffuse across the thicker membrane?
A. 30 hours B. 24 hours C. 20 hours D. 18 hours E. 12 hours
When the equation Sb2S3 + HCl ? SbCl3 + H2S is balanced, the coefficient of H2S is
a. 3. b. 1. c. 2. d. 4.
The warmth you feel from the sun at the beach is an example of
a. heat conduction b. heat convection c. heat radiation d. thermal expansion e. none of the above
A campus bird spots a member of an opposing football team in an amusement park. The football player is on a ride where he goes around at angular velocity ? at distance R from the center. The bird flies in a horizontal circle above him. Will a dropping the bird releases while flying directly above the person's head hit him?
A. Yes, because it falls straight down. B. Yes, because it maintains the acceleration of the bird as it falls. C. No, because it falls straight down and will land behind the person. D. Yes, because it maintains the angular velocity of the bird as it falls. E. No, because it maintains the tangential velocity the bird had at the instant it started falling.