Asked by Adam
a) A sprinter must average 24.0 mi/h to win a 100-m dash in 9.30 s. What is his wavelength at this speed if his mass is 84.5 kg?
b) For potassium metal, the work function W (the minimum energy needed to eject an electron from the metal surface) is 3.68 × 10-19 J. Which is the longest wavelength of the following which could excite photoelectrons?
(550 nm, 500 nm, 450 nm, 400 nm, 350 nm)
b) For potassium metal, the work function W (the minimum energy needed to eject an electron from the metal surface) is 3.68 × 10-19 J. Which is the longest wavelength of the following which could excite photoelectrons?
(550 nm, 500 nm, 450 nm, 400 nm, 350 nm)
Answers
Answered by
DrBob222
The easiest way to do 2 is to calculate the energy of each wavelength listed.
For #2, wavelength = h/mv
Of course you must convert 24.0 mi/h to m/s. The easy way to do that is to type in google "24.9 miles/hour to m/s" without the parentheses and hit the enter key.
For #2, wavelength = h/mv
Of course you must convert 24.0 mi/h to m/s. The easy way to do that is to type in google "24.9 miles/hour to m/s" without the parentheses and hit the enter key.
Answered by
Anonymous
550
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