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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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
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)?
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