What is the surface temperature of a distant star (which emits light as if it were a blackbody) where the peak wavelength is 456 nm? (Hint: The surface of the human body at 35° C has a peak wavelength of 9.41 mm). (1 nm = 10-9 m = 10-3 mm)
a. 5100 K
c. 6040 K
b. 4510 K
d. 6360 K
D
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Exclusion Principle: According to the quantum mechanical model of the hydrogen atom, if the principal quantum number is n, how many different orbital angular momentum quantum numbers are permitted?
A. n/2 B. n C. 2n D. 3n E. 4n
When a bicycle pedal is at the top of its motion, you can exert the greatest torque on the crank by
A. hooking your toes under the pedal and pulling upward. B. pushing straight forward on the pedal with your foot. C. pushing straight down on the pedal with your foot.
Two long parallel wires separated by 5.0 mm each carry a current of 60 A. These two currents are oppositely directed. What is the magnitude of the magnetic field at a point that is between the two wires and 2.0 mm from one of the two wires?
a. 2.0 mT b. 10 mT c. 8.0 mT d. 1.6 mT e. 7.2 mT
Prior to 10^–36 seconds, the Universe existed as one unified force
a. True b. False Indicate whether the statement is true or false