A beam of light with a frequency range from 3.01 × 1014 Hz to 6.10 × 1014 Hz is incident on a metal surface
If the work function of the metal surface is 2.20 eV, what is the maximum kinetic energy of photoelectrons ejected from this surface? (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 0.42 eV B) 0.21 eV C) 0.33 eV D) 0.48 eV E) 0.16 eV
C
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The study of eclipsing binary star systems provides information about the radii of stars.
Answer the following statement true (T) or false (F)
What is one difference between a rad and a rem?
a. A rad measures an amount of radiation and a rem measures a biological effect. b. A rad measures a biological effect and a rem measures an amount of radiation. c. Rem is an older term for rad. d. One rem equals 100 rads. e. One rad equals 100 rems.
The main way astronomers determine the physical and chemical properties of an object in the distant universe is through
A) photography B) spectroscopy C) astrometry D) direct measurement
In the BCC lattice, the interstitial site with coordinates ½,1,½ is called a(n) _____________site.
Fill in the blank(s) with the appropriate word(s).