Calculating Frequency from Energy: A Joules to Frequency Problem

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To calculate the frequency of a light wave with an energy of 2.50x10^-14 Joules, one can use the formula E = h * f, where E is energy, h is Planck's constant, and f is frequency. The discussion highlights a user's request for assistance in solving this physics problem, indicating a lack of familiarity with the concepts involved. Another user suggests searching online for "photon energy to wavelength" as a helpful resource. The interaction emphasizes the importance of using available tools for learning and problem-solving in physics. Engaging with online resources can enhance understanding of such calculations.
Torque-King
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Hi guys,

I'm new to the forum, and I was recently asked this question by my friend:

If a light wave has 2.50x10 to the -14 Joules of energy, what is its frequency?


I'm no good at physics, so I was wondering if you guys could give me a hand. I'm completely clueless.


Thanks,

-Torque-King
 
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Please Google photon energy to wavelength. I doubt that you don't know how to use Google, but will cut you a break this time if you couldn't come up with the search terms.
 
@berkeman Thanks, I'll try it.
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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