In most extrasolar planetary systems the center of mass is likely to be located
A) midway between the star and its most massive planet
B) close to the center of the parent star
C) exactly at the center of the parent star
D) close to the center of the most massive planet
B
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A diffraction grating is to be used to find the wavelength of the emission spectrum of a gas. The grating spacing is not known, but light of a known wavelength of 632.8 nm is deflected by 43.2° in the second order by this grating
Light of the wavelength to be measured is deflected by 34.9° in the second order. What is the wavelength of the light that is to be measured?
What is the maximum altitude of the Sun for an observer located at the north pole (90°N)? On what date will the Sun be observed at the maximum altitude?
Are cosmic rays a form of light?
A) No, they consist of high-energy subatomic particles, not of electromagnetic waves. B) Yes, they are light waves with higher energy than gamma rays. C) Yes, they are light waves with lower energy than radio waves. D) Yes, they are the name we give to all rays of light that come from the cosmos.
Coulomb's Law: Three identical 3.0-µC charges are placed at the vertices of an equilateral triangle that measures 30 cm on a side. What is the magnitude of the electrostatic force on any one of the charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 1.6 N B. 1.8 N C. 2.0 N D. 2.2 N E. 2.4 N