A positive ion has
a. More electrons than protons.
b. More protons than electrons.
c. A +1 charge always.
d. One proton.
Ans: b. More protons than electrons.
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Mars has a sufficient mass and a low enough temperature that water molecules could exist in its atmosphere as vapor. One reason Mars's atmosphere does not contain a significant amount of water vapor is that
a. Mars formed in a part of the solar nebula that lacked oxygen. b. Mars formed in a part of the solar nebula that lacked hydrogen. c. all of the water vapor was released in the impact that formed Deimos. d. ultraviolet radiation breaks the water molecule into less massive particles that can escape. e. the water molecule combines readily with chlorine to form hydrochloric acid.
When a metal surface is illuminated with light of wavelength 437 nm,
the stopping potential for photoelectrons is 1.67 V. (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, e = - 1.60 × 10-19 C, 1 eV = 1.60 × 10-19 J, mel = 9.11 × 10-31 kg) (a) What is the work function of the metal, in eV? (b) What is the maximum speed of the ejected electrons?
The time required for one-half of a radioactive material to decay is called the
A) absolute age. B) half-life. C) date age. D) true-life.
Substitute the correct prefix to the fun-word "10-3 mouse"
A) milli B) kilo C) peta D) pico E) tera