Isotopes of an element have the same number of ________ but different numbers of _______.
A. neutrons, protons
B. electrons, protons
C. protons, neutrons
D. neutrons, electrons
E. protons, electrons
C. protons, neutrons
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The hole for a bolt in a brass plate has a diameter of 1.200 cm at 20°C. What is the diameter of the hole when the plate is heated to 220°C? The coefficient of linear thermal expansion for brass is 19 × 10-6/C°
(Express your answer to 4 significant figures.) A) 1.195 cm B) 1.125 cm C) 1.210 cm D) 1.200 cm E) 1.205 cm
A metal having a work function of 2.8 eV is illuminated with monochromatic light whose photon energy is 3.9 eV. What is the threshold frequency for photoelectron production? (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 7.6 × 1014 Hz B) 8.5 × 1014 Hz C) 2.7 × 1014 Hz D) 9.4 × 1014 Hz E) 6.8 × 1014 Hz
What radionuclide has a well-known percentage
content in all living organisms until the time that they die, and so can be used to determine how long fossil samples have been dead? a) carbon-14 b) carbon-12 c) uranium-238 d) uranium-235
The melting point of aluminum is 660°C, the latent heat of fusion is 4.00 × 105 J/kg, and its specific heat is 900 J/(kg K). 300 kJ of heat are added to 442 g of aluminum at 100°C, what is the final state of the system?
What will be an ideal response?