A 110-V hair dryer is rated at 1200 W. What current will it draw when operating from a 110-V electrical outlet?
A) 90 mA
B) 1.0 A
C) 5.0 A
D) 11 A
E) 14 A
D
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Radiation Activity: The half-life of radioactive iodine-137 is 8.0 days. How many iodine nuclei are necessary to produce an activity of 1.0 ?Ci? (1 Ci = 3.70 × 1010 Bq)
A. 2.9 × 109 B. 4.6 × 109 C. 3.7 × 1010 D. 7.6 × 1012
The ancient Greeks get a lot of attention for their contributions to science because ________
A) they were the only ancient culture that kept written records of their astronomical observations B) they were the first people to realize that Earth is a planet orbiting the Sun C) they were the first people known to try to explain nature with models based on reason and mathematics, without resort to the supernatural D) the books of every other culture were lost in the destruction of the library of Alexandria
In a two-slit experiment, the slit separation is 3.00 × 10-5 m. The interference pattern is recorded on a flat screen-like detector that is 2.00 m away from the slits
If the seventh bright fringe on the detector is 10.0 cm away from the central fringe, what is the wavelength of the light passing through the slits? A) 100 nm B) 204 nm C) 214 nm D) 224 nm E) 234 nm
The electromagnetic radiation that causes tanning:
a. can produce cancer. b. rarely passes through glass windows. c. is absorbed by ozone. d. is all of the above.