When using an eyepiece of focal length f, the Yerkes refracting telescope gives a magnification of 800 . What focal length eyepiece would yield a magnification of 500?
a. (8/5)2f b. (5/8)f
c. (8/5)f d. (5/8)2f
c
You might also like to view...
Inelastic Collisions: A 2200-kg auto moving northward at 12.0 m/s runs into a 3800-kg truck which is also moving northward, but at 5.00 m/s. If the vehicles lock bumpers, how fast are they moving just after the collision?
Fill in the blank(s) with the appropriate word(s).
Suppose the energy of the longest-wavelength photon emitted by an electron in a box of length L is Eph. What is the energy of the photon with the fourth-longest wavelength that might be emitted?
A. (4/3)Eph B. (5/3)Eph C. (7/3)Eph D. (8/3)Eph E. 3Eph
Astronomers believe that the massive object at the center of the Milky Way is a black hole because
A. it is necessary to explain the Galaxy's rotation curve. B. images show an accretion disk surrounding an empty spot. C. gravitational wave measurements indicate a black hole is there. D. observations at X-ray waves, infrared waves, and radio waves limit the size of the object to smaller than 10 AU.
A proton is located at the point (x = 1.0 nm, y = 0.0 nm) and an electron is located at the point Find the magnitude of the electrostatic force that each one exerts on the other. (k = 1/4??0 = 9.0 × 109 N ? m2/C2, e = 1.6 × 10-19 C)
A) 1.4 × 10-11 N B) 5.3 × 10-18 N C) 5.3 × 108 N D) 5.9 × 10-15 N