0ms what is the perceived wavelength to three

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Unformatted text preview: at 1000 Hz. If the car is traveling in a straight line at 20.0m/s, what is the perceived wavelength (to three significant figures) as measured by someone standing on the road directly in front of the car? Take the speed of sound to be 335 m/s. a. 0.305 m b. 0.203 m c. 0.315 m d. 0.335 m 27. Converging lenses can produce: a. Only upright images b. Only inverted images c. Both upright and inverted images depending on the distance of the object d. Both upright and inverted images simultaneously 30. A roller coaster of mass 200 kg starts from a height of 50.0 m going plunges to a height of 0.0 m, goes then uphill again and comes to rest on top of the hill at 40.0 m height. The total distance travelled is 150 m, and some amount of work was done against fritional forces on the track. 50 40 0 a. b. c. d. 28. An electron is accelerated from rest through a potential difference of 3.0⋅103V in a particle accelerator. How fast will it be moving after this acceleration in m/s? 8 a. 8.7 × 10 3 b. 2.4 × 10 6 c. 2.3 × 10 7 d. 3.2 × 10 29. 10 kg of the isotope tritium, which has a halflife of 12.3 years, is produced at a reactor. Which of the following values, in kg, is closest to the mass of tritium that will remain after 30 years? a. 7.5 b. 1.8 c. 0.9 d. 6.6 750 J 1950 J 1500 J 19600 J 31. A layer of ethyl alcohol (index of refraction n = 1.361) lies on top of water (index of refraction n = 1.333). At what angle relative to the normal to the interface between the two liquids, to the nearest degree, is the light from ethyl alcohol to water totally reflected internally? a. 78° b. 88° c. 68° d. There is no critical angle 32. A compound microscope is made with an objective lens with focal length f0 = 0.90 cm and an eyepiece with focal length fE = 1.1 cm. The lenses are separated by a distance of 10 cm. If an object is 1.0 cm in front of the objective lens, where will the final image be located (to the nearest cm) with respect to the eyepiece? a. -30 cm b. -15 cm c. -23 cm d. -11 cm Page 5 of 15 ©Prep101...
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