What is the photon energy of red light having a wavelength of 6.40 × 102 nm? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 1.13 × 10-19 J
B) 1.31 × 10-19 J
C) 3.11 × 10-19 J
D) 1.94 × 10-19 J
C
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The current in two identical light bulbs connected in series is 0.25 A. The voltage across both bulbs is 110 V. The resistance of a single light bulb is
A) 22 ohms. B) 44 ohms. C) 220 ohms. D) 440 ohms. E) none of the above
The equation H2O2 ? H2O + O is not correctly written because
a. the number of atoms of each element on each side is not the same. b. the mass indicated on each side is not the same. c. oxygen is diatomic. d. hydrogen peroxide decomposes to H2O and H.
Every square inch of our body, at sea level, sustains ______________ of atmospheric pressure
a. 14.7 lb b. 1.47 g c. 14.7 g d. 1.47 lb
Only two elements, mercury and ______________, are liquid at room temperature and atmospheric pressure
a. sodium b. bromine c. phosphorus d. iodine