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. What is the temperature at the point where the two rods are in contact with one another? The thermal conductivity of silver is 417 W/m ? K, and that of gold is 291 W/m ? K.
A) 47°C B) 39°C C) 41°C D) 59°C E) 53°C
D
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The process of removing an electron from a stable nucleus is known as ____________________
Fill in the blank(s) with correct word
A light beam with wavelength 440. nm in a material then enters air and its wavelength becomes 577. nm
(a) What is the index of refraction for the material? (b) At what angle with the surface will the beam be totally reflected back in the material?
According to current understanding, the first generation of stars in the universe ________ than differ stars born today.
A) were much more massive B) contained much more hydrogen and helium C) were much cooler in temperature D) were much more likely to be members of binary star systems
A person who sees more clearly under water without eyeglasses or a facemask is
A) nearsighted. B) farsighted. C) neither of these