Question:
What value does Einstein quote for Lenard’s measurement of the “largest effective wavelength for air”? Express your answer as an integer in units of nanometers.
Solution:
Reading Einstein's original paper at wikisource, I found a line:
"According to Lenard's measurements for air the largest wavelength that has an effect is about 1.9·10-5 cm, so"
So the answer is $ 1.9 \times 10^{-5} \times 10^{-2} = 1.9 \times 10^{-7} = 190 \times 10^{-9} $ meters, or in other words, 190 nanometers.
What value does Einstein quote for Lenard’s measurement of the “largest effective wavelength for air”? Express your answer as an integer in units of nanometers.
Solution:
Reading Einstein's original paper at wikisource, I found a line:
"According to Lenard's measurements for air the largest wavelength that has an effect is about 1.9·10-5 cm, so"
So the answer is $ 1.9 \times 10^{-5} \times 10^{-2} = 1.9 \times 10^{-7} = 190 \times 10^{-9} $ meters, or in other words, 190 nanometers.
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