Homework Help: Physics

Posted by hannah on Thursday, February 9, 2012 at 8:45pm.

15 At a particular location and time, sunlight is measured on a 1 m2 solar collector with an
intensity of 500.0 W. If the peak intensity of this sunlight has a wavelength of 5.60 x 10-7 m,
(a) What is the frequency of this light? When you input large numbers such as those in this
problem, then input the numbers with parenthesis so as to obtain the correct answer. (b)
What is the energy of one photon of this light? (c) How many photons are arriving each
second? When you input large numbers such as those in this problem, then input the
numbers with parenthesis so as to obtain the correct answer.

Physics - drwls, Friday, February 10, 2012 at 1:54am
(a) frequency = (3*10^8 m/s)/(5.60*10^-7m) = ____ Hz
(b) E = h*(frequency) = ___ J
where h is Planck's constant.
(c) Photon arrival rate =
500 Watts/E(Joules per photon)
= _____ photons/sec

I don't get the significance of putting large numbers in parentheses. It does not make the calculation more accurate. Just use scientific notation.

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