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What if they wanted 2 photons? Multiply by two. An expression of co(x,T,d) has been derived from the half-maximum photo-response curve calculation. A shift of the cut-off wavelength was found from the photo-response calculation for the HgCdTe devices with the same energy gap Eg but different thickness d. The above number is for one photon of energy. The determination of cut-off wavelength, co, and composition distribution for Hg1-xCdxTe has been discussed in this paper. Now we can plug into our energy equation to find Joules of energy for one photon. Plug into equation to find frequency ( v). (notice how similar this is to number 1!) Calculate the energy of one photon of yellow light that has a wavelength of 589nm. Now we simply plug in, making sure that our units match (convert 12.9cm to meters)ĥ. First we convert KHz to Hz.Į=h v(Energy (J) = frequency (Hz) times Planck’s constant (Joule-Second or J-S))Ĭ= 2.998 x 10 8 m/s (this problem wants us to use this number for speed of light), h=6.626 x 10 -34J-s This one is nice and easy- we are given the same units. Calculate the frequency of this microwave.įrom our equation, we know that c=λ v. A certain microwave has a wavelength of 0.032 meters.
#Cut off wavelength absorption of photon how to#
This is a very commonly missed step! We must have all units when dividing be equal. 589 nanometers= 5.89 × 10 -7 meters (review dimensional analysis if you do not know how to get this number).Ģ. (speed of light (meters) = wavelength (meters) times frequency (hertz))Ĭ = 3.00 × 10 8 m/s (sometimes this is represented as 2.998 × 10 8 m/s, but the key I pulled these questions from uses the former value. We are given wavelength in nanometers and asked to find frequency.įrom our equation, we know that c=λ v.
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Calculate the energy of one photon of yellow light that has a wavelength of 589nm.ġ.The yellow light given off by a sodium vapor lamp used for public lighting has a wavelength of 589 nm. What is the energy of exactly one photon of this microwave radiation?ĥ. What is the wavelength of the radio waves?Ĥ. Microwave ovens emit microwave energy with a wavelength of 12.9 cm. Calculate the frequency of this microwave.ģ. A radio station broadcasts at a frequency of 590 KHz. What is the frequency of this radiation?Ģ. A certain microwave has a wavelength of 0.032 meters. The yellow light given off by a sodium vapor lamp used for public lighting has a wavelength of 589 nm.