A brass plate at room temperature radiates 10 W of blackbody radiation. If the plate is cooled to –30°C, does the peak of maximum radiated intensity shift toward shorter wavelengths, shift toward longer wavelengths, or remain the same? Explain.
A -diameter oil droplet is observed between two parallel electrodes spaced apart. The droplet hangs motionless if the upper electrode is more positive than the lower electrode. The density of the oil is .
a. What is the droplet’s mass?
b. What is the droplet’s charge?
c. Does the droplet have a surplus or a deficit of electrons? How many?
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