An electron has the same de Broglie wavelength as the wavelength of a 1.8 eV photon
What is the speed of the electron? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J)
A) 840 m/s B) 910 m/s C) 980 m/s D) 770 m/s E) 1100 m/s
E
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A monochromatic (single frequency, single wavelength) light ray in air (n = 1) enters a glass prism (n = 1.5). In the glass prism
a. both the frequency and the wavelength are the same as in air b. the frequency is the same, but the wavelength is greater than in air. c. the frequency is the same, but the wavelength is smaller than in air. d. the wavelength is the same, but the frequency is greater than in air. e. the wavelength is the same, but the frequency is smaller than in air.
What are the three main types of hearing loss?
On the average, in a ferromagnetic domain permanent atomic magnetic moments are aligned ____ to one another
a. antiparallel b. parallel c. perpendicular d. alternately parallel and antiparallel e. randomly relative
The reason that most extrasolar planets discovered by the transit technique are found close to their parent stars is
A) the closer to a star, the hotter and therefore brighter the planet is. B) they transit more frequently, and have thus been more likely to be detected in the short time we have been searching for them. C) the wavelength shift of the star's spectrum is larger. D) planets that are close to a star are heated up and therefore larger. E) more of the starlight is blocked by the planet when it transits the star.