The "seeing ability" or resolution of radiation is determined by its wavelength. If an atom is approximately 10-10 m in diameter, how fast must an electron travel to have a wavelength smaller than the size of an atom?
7.3 × 10^6 m/s
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Elementary Particles: Which of the following particles are leptons? (There may be more than one correct choice.)
A. protons B. neutrons C. electrons D. photons E. quarks
A 25 cm focal length mirror has a 3.0 cm tall object placed 20 cm in front of it. Where is the image, and is it real or virtual?
A. 5.0 cm behind the mirror, virtual B. 11 cm in front of the mirror, real C. 100 cm in front of the mirror, real D. 100 cm behind the mirror, virtual E. 45 cm behind the mirror, virtual
An astronaut is standing on the surface of a planetary satellite that has a radius of 1.74 × 106 m and a mass of 7.35 × 1022 kg
An experiment is planned where a projectile needs to be launched straight up from the surface. What must be the minimum initial speed of the projectile so it will reach a height of 2.55 × 106 m above this satellite's surface? (G = 6.67 × 10-11 N ? m2/kg2)
This figure shows the life track of a 1 solar-mass star from its beginnings in a collapsing cloud fragment until it becomes a main-sequence star. At which of the numbered points is the object generating energy primarily from gravitational contraction?
A) Points 1, 2, and 3 B) Point 1 only C) Point 2 only D) Point 3 only E) Point 4 only F) Points 1 and 2 only