Physics
ATLAYZ:

When two light beams of wavelengths 1and fall on a metal surface, they produce photoelectrons with energies 115 eV and 254 eV respectively. Estimate the numerical value of the Planck constant.

AZ:

You had some formatting error when you posted your question. What are the wavelengths of the two beams? You're going to use the formula: E = hf E is energy h is Planck's constant (which is what you're solving for) f is frequency You'll notice that we we're given the energy (115 eV and 254 eV) but we don't know the frequencies. You use another formula to calculate the frequency $$c = \lambda f$$ c is the speed of light which is a constant 3.0*10^8 m/s $$\lambda$$ is the wavelength which is given to you in your question f is the frequency You could plug that into the first formula to get $$\sf E = \dfrac{h c}{\lambda}$$ You have values for everything besides 'h' which is what you're trying to solve for

AZ:

Let me know how far you get in solving your problem or if you'd like any further clarification :)

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