Why is using a lumped heat capacity model for melting or freezing a sphere acceptable?
What will be an ideal response?
During melting or freezing the temperature a sphere is theoretically uniform
throughout and this indicates an infinite or very high effective conduction as
compared to the convection the sphere’s surface and giving a very low Biot
number, less than 0.1.
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By casually glancing at a scene on your TV you are
A) affecting the image. B) participating in the action on the screen. C) both of these D) neither of these
Photoelectric Effect: A metallic surface is illuminated with light of wavelength 400 nm. If the work function for this metal is 2.40 eV, what is the maximum kinetic energy of the ejected electrons, in electron-volts? (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
Fill in the blank(s) with the appropriate word(s).
Venus' rotation period is longer than its period of revolution around the Sun
Indicate whether the statement is true or false
The Eocene is a geologic______________
Fill in the blank(s) with correct word