A common use of a diffraction grating is to
A. focus light onto the retina.
B. split light into different polarizations.
C. reflect light into a different direction.
D. separate light into its separate wavelengths.
Answer: D
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Three resistors connected in parallel have the individual voltages labeled DV1, DV2, and DV3, respectively. Which of the following expresses the total voltage DVT across the three resistors when connected in this manner?
a. DVT = (1/DV1 + 1/DV2 + 1/DV3) c. DVT = (1/DV1 + 1/DV2 + 1/DV3)-1 b. DVT = DV1 + DV2 + DV3 d. DVT = DV1 = DV2 = DV3
The energy of a photon is proportional to
A. its polarization. B. its wavelength. C. its frequency. D. its mass.
Light having a wavelength equal to the peak wavelength of a star of what temperature can produce photoelectrons from manganese 
A. 960 K B. 23000 K C. 9600 K D. 96000 K E. 2300 K
A 30-?F capacitor is charged to 80 V and then connected across an initially uncharged capacitor of unknown capacitance C. If the final potential difference across the 30-?F capacitor is 20 V, determine C
a. 60 ?F b. 75 ?F c. 45 ?F d. 90 ?F e. 24 ?F