Although tornadoes occur in many parts of the world, they are very common
A) along the Gulf Coast.
B) in the northeastern part of the United States.
C) in the Central Plains.
D) on the western slopes of the Rockies.
Answer: C
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The amount of diffraction a telescope creates depends upon:
A) whether the telescope is a refractor or a reflector. B) the wavelength and the diameter of the telescope objective. C) the magnification of the eyepiece. D) the types of glass used in the achromat. E) the transparency of the atmosphere.
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A square loop (length along one side = 20 cm) rotates in a constant magnetic field which has a magnitude of 2.0 T. At an instant when the angle between the field and the normal to the plane of the loop is equal to 20° and increasing at the rate of 10°/s, what is the magnitude of the induced emf in the loop?
a. 13 mV b. 0.27 V c. 4.8 mV d. 14 mV e. 2.2 mV
The ionization energy of the hydrogen atom is 13.6 eV. What is the wavelength of a photon having this much energy? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, 1 eV = 1.6 × 10^?19 J, and 1 nm = 10?9 m)
a. 91.4 nm b. 136 nm c. 273 nm d. 360 nm