If an electron has a measured wavelength of 1.20 × 10^-10 m, what is its kinetic energy? (h = 6.63 × 10^-34 J×s, 1 eV = 1.6 × 10^-19 J, and me = 9.11 × 10^-31 kg)
a. 209 eV
c. 105 eV
b. 55.0 eV
d. 147 eV
C
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A porch roof sloping at 45° accumulated snow to a depth of 30. cm. The roof measured 3.0 m × 5.0 m. If the density of snow was 15. kg/ m2, what was the weight of the snow, in pounds, on the roof?
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a. True b. False Indicate whether the statement is true or false