A microscope has an objective lens of focal length 1.40 mm and an eyepiece of focal length 20.00 mm
It is adjusted for minimum eyestrain for persons with a near point of 25.0 cm. A blood sample is placed 1.50 mm from the objective. How far apart are the lenses?
A) 20 mm
B) 21 mm
C) 23 mm
D) 41 mm
D
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Theoretical physicists have had the least success in combining which force with the electromagnetic force?
a. strong nuclear force b. weak nuclear force c. gravitational force d. electrical Coulomb force
Death Valley in California receives many German tourists. When you convert a summer temperature reading of 130° F to the Celsius scale they use at home, you find that the Celsius temperature is about
a. 26° C. b. 54° C. c. 72° C. d. 176° C e. 327° C.
Compared with the photons of light that shines on glass, the emerging photons are
A) the same photons. B) different though identical. C) a mixture of being the same and different.
If a K0 meson at rest decays in 0.90 × 10^-10 s, how far will a K0 meson moving at 0.95c travel through a bubble chamber? (c = 3.00 × 10^8 m/s)
a. 2.6 cm c. 9.3 cm b. 8.2 cm d. 13 cm