Consider an atom of gold in which the nucleus contains 79 protons and 118 neutrons. What is its atomic number and atomic weight?
A) The atomic number is 79, and the atomic weight is 197.
B) The atomic number is 79, and the atomic weight is 118.
C) The atomic number is 118, and the atomic weight is 197.
D) The atomic number is 118, and the atomic weight is 79.
A
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One reason why we know that magnetic fields are not the same as electric fields is because the force exerted on a charge +q
a. is in opposite directions in electric and magnetic fields. b. is in the same direction in electric and magnetic fields. c. is parallel to a magnetic field and perpendicular to an electric field. d. is parallel to an electric field and perpendicular to a magnetic field. e. is zero in both if the charge is not moving.
Once carbon is formed in massive star cores, the majority of nuclei formed form then on will belong to even numbered elements, due to addition to more helium nuclei as alpha particles
Indicate whether the statement is true or false
An inventor proposes to equip an office with a polarized source of background music and polarizing earplugs for non-listeners. His idea is
A) a good one that provides personal choice. B) too expensive. C) bothersome. D) nonsense because sound cannot be polarized.
A chimney is constructed of square concrete blocks with a round flue as shown in Figure 2-56. Estimate the heat loss through the cement blocks per meter of chimney if the outer surface temperature is -10ºC and the inner surface temperature is 150ºC.
