A 10 D lens is placed in contact with a 15 D lens. What is the refractive power of the combination?
A. 15 D
B. 25 D
C. 0.67 D
D. 5.0 D
E. 1.5 D
B. 25 D
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Wave Characteristics: What is the wavelength used by a radio station that broadcasts at a frequency of 920 kHz? (c = 3.00 × 108 m/s)
A. 22.6 m B. 226 m C. 326 m D. 175 m E. 276 m
The 500-m-long spaceship Springbrake is at rest on the planet Hitest for refueling. Another spaceship, Summerbrake, passes parallel to Springbrake at 0.600c. The crew on Springbrake measure the length of Summerbrake as it passes and find that the length they measure is exactly the same as the known 500-m rest length of Springbrake. If Summerbrake were at rest next to Springbrake, its length would
then be measured to be a. 180 m. b. 320 m. c. 500 m. d. 625 m. e. 781 m.
The Harvard College Observatory Computers from c. 1880 into the early 20th century were:
A) the first digital computers. B) not much different than cash registers. C) functionally similar to the modern 4- function calculator. D) a group of women who made important contributions to astronomy. E) mechanically operated adding machines.
A nearsighted person has a far point of 50 cm for his right eye and 150 cm for his left eye. For each eye, what power contact lens will allow the person to see gorgeous sunsets?
What will be an ideal response?