The principal quantum number is symbolized by the letter ______________
Fill in the blank(s) with correct word
n
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The average distance between Earth and the Sun is called a light-year
Indicate whether the statement is true or false
Conduction: Two metal rods, one silver and the other gold, are attached to each other end-to-end. The free end of the silver rod is immersed in a steam chamber at 100°C, and the free end of the gold rod in an ice water bath at 0°C. The rods are both 5.0 cm long and have a square cross-section that is 2.0 cm on a side. No heat is exchanged between the rods and their surroundings, except at the ends. How much total heat flows through the two rods each minute? The thermal conductivity of silver is 417 W/m ? K, and that of gold is 291 W/m ? K.
A. 8.2 kJ B. 9.5 kJ C. 12 kJ D. 14 kJ E. 16 kJ
The mass of 6 million atoms of a diatomic gas is 
What is the atomic mass of this gas?
A. 25.5 u B. 51.0 u C. 2.55 u D. 5.10 u
What is the radius of curvature of the path of a 3.0-keV proton in a perpendicular magnetic field of magnitude 0.80 T?
a. 9.9 mm b. 1.1 cm c. 1.3 cm d. 1.4 cm e. 7.6 mm