What primary wavelength and corresponding photon energy is emitted by a body at: (a) 400.°C? (b) 800.°C? (c) 1200.°C?
What will be an ideal response?
(a) 4.31 μm, 0.288 eV
(b) 2.70 μm, 0.459 eV
(c) 1.97 μm, 0.630 eV
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Mid-sized black holes of a few thousand solar masses have been found in the cores of some
a. open clusters. b. emission nebulae. c. elliptical galaxies. d. globular clusters. e. dark molecular clouds.
A 450-kg sports car accelerates from rest to 100 km/h in 4.80 s. What is the magnitude of the net force exerted on a 68.0 kg passenger during the acceleration?
A) 394 N B) 82.0 N C) 342 N D) 311 N
Circular Motion of Charges: A doubly charged ion with speed 6.9 × 106 m/s enters a uniform 0.80-T magnetic field, traveling perpendicular to the field. Once in the field, it moves in a circular arc of radius 30 cm. What is the mass of this ion? (e = 1.60 × 10-19 C)
A. 11 × 10-27 kg B. 6.7 × 10-27 kg C. 3.3 × 10-27 kg D. 8.2 × 10-27 kg
If a wave's frequency doubles and its speed stays constant, its wavelength
A) becomes 16× longer. B) is also doubled. C) is unchanged, as c is constant. D) is now 4× longer. E) is halved.