The power consumed by a device drawing 0.8 A when connected to 120 V is
A) 12 W.
B) 15 W.
C) 60 W.
D) 96 W.
E) 120 W.
Answer: D
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A large luminosity star
a) is always at a larger distance than a small luminosity star b) emits more light than a low luminosity star c) is always redder than a star with a small luminosity d) is at a lower temperature than a small luminosity star e) is always at a smaller distance than a small luminosity star
An object 4 cm high is placed 15 cm in front of a convex mirror with a focal length of ?10 cm. What is the image position (in cm)?
A. ?8 B. ?4 C. ?2 D. ?6 E. 30
An atom in a state with its orbital quantum number l = 1 decays to its ground state (with l = 0). A photon of wavelength 630.000 nm is emitted in the process
When the same process takes place in the presence of an intense magnetic field, the following change in the spectrum is observed. With the magnetic field present, one of the emitted lines observed now has a wavelength of 630.030 nm. Which of the following wavelengths would you expect to be also present? A) 630.060 nm B) 629.970 nm C) 630.090 nm D) 629.910 nm E) 630.120 nm
A 2.0 ?F capacitor is charged to 12. V and then discharged through 4 × 106 ?. How long will it take for the voltage across the capacitor to drop to 3.0 V?
What will be an ideal response?