This photograph was taken on the surface of another world in our solar system. What world is it?
A) Mars
B) Venus
C) the Moon
D) Triton
A) Mars
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Which of the following statements is true of the protons in an atom?
A) They are electrically neutral. B) They are positively charged. C) They lack an electric field around them. D) They are made up of multiple neutrons.
A nonrelativistic electron is accelerated from rest through a potential difference. After acceleration the electron has a de Broglie wavelength of 880 nm
What is the potential difference though which this electron was accelerated? (h = 6.626 × 10-34 J ? s, e = -1.60 × 10-19 C, mel = 9.11 × 10-31 kg) A) 1.9 µV B) 1.7 µV C) 2.2 µV D) 2.5 µV
In a mass spectrometer, an ion will have a smaller radius for its circular path if
a. its speed is greater. b. its mass is greater. c. its charge is greater. d. the magnetic field is weaker.
Dalton developed ________ as one of the foundations for the atomic theory.
A. the Principle of Equivalence B. the Law of Definite Proportions C. Mach's Principle D. the law of supply and demand E. the index of refraction