A quantum of radiation has an energy of 1.5 keV. What is its frequency? (h = 6.63 × 10^?34 J?s and 1 eV = 1.60 × 10^?19 J)
a. 3.6E+14 Hz
b. 3.6E+17 Hz
c. 2.3E+17 Hz
d. 2.4E+18 Hz
e. 1.4E+17 Hz
b
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The energy source at the center of our galaxy
a. is not visible at optical wavelengths. b. produces X-rays. c. must be less than 10 AU in diameter. d. is not visible at optical wavelengths, produces X-rays, and must be less than 10 AU in diameter. e. None of the other choices are correct.
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What will be an ideal response?
A flashlight bulb operating at a voltage of 5.0 V has a resistance of 7.0 ?. How many electrons pass through the bulb filament per second (e = 1.6 × 10^?19 C)?
a. 1.1E+16 b. 5.6E+21 c. 2.2E+17 d. 4.5E+18 e. 8.8E+19
Light from a He-Ne laser of wavelength 633 nm passes through a circular aperture. The resulting pattern is observed on a screen 4.0 m behind the aperture, where the width of the central bright circle is 1.1 cm. What is the diameter of the hole?
A) 4700 ?m B) 32,000 ?m C) 9.8 ?m D) 560 ?m