What is the name of the galaxy cluster to which the Milky Way belongs?
A. the Scorpius group
B. the Sagittarius cloud
C. M31
D. the local group
E. the Virgo cluster
Answer: B
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Characteristics of Waves: If a wave has a speed of 362 m/s and a period of 4.17 ms, what is its wavelength?
A. 1510 m B. 1.51 m C. 86.8 m D. 86,800 m E. 0.0115 m
Diffraction Gratings: When light illuminates a diffraction grating with 7000 lines per centimeter, its second order maximum is at 62.4°. What is the wavelength of the light?
A. 336 nm B. 363 nm C. 633 nm D. 752 nm
Refracting Telescope: You have a choice between two lenses of focal lengths fa and fb, where fb = 2fa, to use as the objective lens in building a refracting telescope. If the magnification you obtain using lens a is Ma, what will be the magnification when using lens b?
A. Mb = 2 Ma B. Mb = 4 Ma C. Mb = 8 Ma D. Mb = Ma/4 E. Mb = Ma/2
How much power is theoretically available from a mass flow of 1 000 kg/s of water that falls a vertical distance of 120 m?
a. 1.18E+6 kW b. 1.20E+5 kW c. 1.18E+3 W d. 8.17E+1 W e. 1.18E+6 W