Answer:
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Answer:
A. The cost of producing a kilowatt of power with fuel cell will be less than $30 in 2015
4) would be your correct answer
Different isotopes of the same element emit light at slightly different wavelengths, the minimum number of slits is mathematically given as
N=1820slits
<h3>What minimum number of slits is required to resolve these two wavelengths in second-order?</h3>
Generally, the equation for the wave is mathematically given as

Where the chromatic resolving power (R) is defined by

R = nN,
Therefore


and


In conclusion, the minimum number of slits is required to resolve these two wavelengths in second-order

Therefore

N=1820slits
Read more about slits
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Physical change is where u change physically or on the "outside" hope this helps, have a great day!