Dear classmates
...
Solve the
following exercises:
1. Gold has
a work function of 4.83 eV.
a) What is
the value of the threshold frequency? I.e., what is the lowest frequency for
electromagnetic radiation incident on a gold surface if photoelectrons are to
be emitted in the photoelectric effect? Answer ___________
b) Now
suppose that ultraviolet light with a wavelength of 150 nm shines on a gold
surface. What is the stopping potential? I.e., what is the potential of the
collector relative to the emitter which will barely prevent electrons from
making it to the collector and producing a current? Answer ___________
2. if we assume the following: Our Sun has a surface temperature
of about 6000 K. A particular blue giant has a surface temperature of 30,000 K.
And a particular red dwarf has a surface temperature of 3000 K.
For
each of these stars, determine λmax , the wavelength at the peak in the plot of intensity versus
wavelength. Sun ______________ blue giant _____________ red dwarf _____________
with my best
thoughts for everyone
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