Magnifying Glass With the Image at Infinity: A person having a near point of 25 cm uses a magnifying glass with a focal length of 10 cm. What is the angular magnification of the glass for that person when her eyes are focused at infinity?
A. 1.5
B. 2.5
C. 3.5
D. 4.5
Answer: B
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________ binary star systems are important because they allow astronomers to determine the mass and the ________ of the stars in the system.
A. Spectroscopic; temperature B. Eclipsing; temperature C. Visual; temperature D. Eclipsing; diameter E. Spectroscopic; diameter
With molar quantity and temperature held constant, by what factor does the pressure of an ideal gas change when the volume is five times bigger?
a. 1/5 b. 1 c. 5 d. 25
Magnetic fields are produced by
a. constant electric currents. b. electric currents that vary sinusoidally with time. c. time-varying electric fields. d. all of the above. e. only (a) and (b) above.
In a particle accelerator, protons are fired at a stationary target and collide elastically with the nuclei of the atoms in the target. In one such experiment, a beam of protons is fired with a speed of 2.10 × 107 m/s
The protons that undergo a collision rebound with a speed of 1.68 × 107 m/s. What is the mass of the nuclei that the protons are colliding against? A) 6.00 proton masses B) 7.00 proton masses C) 8.00 proton masses D) 9.00 proton masses E) 10.0 proton masses