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When I copy/paste that line into bash, it gives the answer -87.6, which is quite obviously incorrect. It has to be incorrect because the number simply cannot be that large and negative; only 3.6 is subtracted from what has to be a positive number because the operators are all multiplication and division, and all numbers are positive.
The result is actually a voltage, since the energy computation is divided by the electronic charge. This means that the 3.6 is volts, not eV. Looks like something to do with a space charge potential.
It's an energy computation in eV for the maximum energy of electrons emitted from Zinc as a result of incident photons of wavelength 250 nM. Algebraically it is (h c / λ) - φ modified with the charge on an electron as a Joules to eV unit conversion factor. You can't get away with anything on LQ -- no stone left unturned!
@pixellany: yet another reason to learn about python someday.
@sahko: zsh's zcalc is impressive,
@Woodsman: I ruled out KDE-based solutions, wanting to keep the computer KDE-free.
@shadowsnipes: I decided on Speedcrunch after reading reviews and ruling out Galculator as probably large, given its graphing capability although I may come back to it if I ever want a graphing calculator.
For completeness here is a list of all identified calculators, far too many to even look at reviews of them all
For completeness here is a list of all identified calculators, far too many to even look at reviews of them all
Good Grief!!!!
Quote:
There's nothing much to learn about python:
Well......maybe not to do simple arithmetic.....
Code:
Python 2.6.3 (r263:75183, Oct 4 2009, 11:40:05)
[GCC 4.4.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> sin (30)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'sin' is not defined ##OK--forgot to import the math module
>>> import math
>>> sin (30)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'sin' is not defined ##forgot to say "math.sin"
>>> math.sin(30)
-0.98803162409286183 ##Oops, python works in radians
>>> math.sin(30*pi()/180)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'pi' is not defined ##so it's math.pi, maybe?
>>> math.sin(30*math.pi()/180)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'float' object is not callable ##Huh?
>>> help
Type help() for interactive help, or help(object) for help about object.
>>> help math
File "<stdin>", line 1
help math
^
SyntaxError: invalid syntax
>>> help pi
File "<stdin>", line 1
help pi
^
SyntaxError: invalid syntax
###Arrrrgh!! Am I to believe Python does not know what pi is??????........
>>>
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