A student walks 1.0 mi west and then 1.0 mile north, after ward how far is she from her starting point?
A 1.0 mi
B 1.4 mi
C 1.6 mi
D 2.0 Mi
Answer: B. 1.4 mi
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A radio station broadcasts at a frequency of 80 MHz. How far from the transmitter will this signal travel in 67 ms? (c = 3.0 × 108 m/s)
A) 60 × 106 m B) 67 m C) 40 km D) 80 km E) 20 × 106 m
As the temperature of a radiation emitting blackbody becomes higher, what happens to the peak wavelength of the radiation?
a. increases b. decreases c. remains constant d. is directly proportional to temperature
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) 4.6 × 109 B) 7.6 × 1012 C) 2.9 × 109 D) 3.7 × 1010
Two objects are in all respects identical except for the fact that one was coated with a substance that is an excellent reflector of light while the other was coated with a substance that is a perfect absorber of light
You place both objects at the same distance from a powerful light source so they both receive the same amount of energy U from the light. The linear momentum these objects will receive is such that: A) The reflecting objects receives a larger amount of momentum. B) Both objects receive the same amount of momentum. C) The reflecting object receives a smaller amount of momentum. D) None of the previous answers is correct.