A 10-cm focal length converging lens is used to magnify small newspaper print 2.0 mm high. Calculate the height of the image (in mm) for the maximum magnification for a normal eye.
A. 3.5
B. 7.0
C. 9.2
D. 12
E. 2.5
Answer: B
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Sunspots are cooler than the surrounding gas in the photosphere because
A) they are regions where convection carries cooler material downward. B) there is less fusion occurring there. C) magnetic fields trap ionized gases that absorb light. D) strong magnetic fields slow convection and prevent hot plasma from entering the region. E) magnetic fields lift material from the sunspot and quickly cool the material.
Internal forces cannot change the total kinetic energy of a system
Indicate whether the statement is true or false
Planet Roton has a mass of 4.0 × 10^23 kg and a radius of 2.0 × 10^6 m. With what speed should a space probe be launched from the surface of Roton so as to achieve a maximum distance of 3.0 × 10^6 m from the center of Roton?
a. 4.2 km/s b. 3.9 km/s c. 3.0 km/s d. 3.4 km/s e. 6.0 km/s
A puddle of water (n = 1.33) is covered with a very thin layer of oil (n = 1.20). How thick is the oil in the region that strongly reflects light with a wavelength of 497 nm?
a. 207 nm c. 458 nm b. 550 nm d. 229 nm