Which of the following has the lowest frequency?
a) Ultraviolet
b) Microwaves
c) X-ray
d) Radiowaves
Ans: d) Radiowaves
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A sheet of red paper will look black when illuminated with
A) red light. B) yellow light. C) magenta light. D) cyan light. E) none of the above
Power: The heating element of a toaster is a 5.4-m length of nichrome wire of diameter 0.48 mm. The resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ? ? m. The toaster is designed to operate at a voltage of 120 V. How much power does it draw in normal operation?
A. 370 W B. 360 W C. 380 W D. 400 W E. 410 W
Basic Postulates: If you were in a spaceship traveling close to the speed of light with respect to Earth, you would notice that
A. some of your physical dimensions were smaller than normal. B. your mass was less than normal. C. your mass was greater than normal. D. your pulse rate was greater than normal. E. None of these effects occur.
Consider a situation where two moving objects collide and rebound from each other. Internal energy
a. remains constant b. decreases c. increases d. varies but in a way that cannot be predicted