5. (15 points) Consider visible light (wavelength from 400nm to 700nm) at room temperature (300K). Constants: Speed of light: $c = 3 \times 10^8 \text{m/s}$; Planck's constant: $h = 6.62 \times 10^{-34} \text{J/s}$; Boltzmann constant: $k_B = 1.38 \times 10^{-23} \text{J/degree}$. a) (5 points) What is the frequency range of visible light? b) (10 points) Estimate the energy intensity of light in the visible region.
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Planck's constant h = 6.6256 x 10^-34 J·sec; speed of light c = 2.9979 x 10^8 m/s. For electromagnetic radiation with a wavelength of 228.8 nm: (a) What is the frequency of the radiation (in s^-1)? (b) What is the energy (in J) of one photon of the radiation? (c) What is the energy (in kJ) of one mole of photons of the radiation?
Adi S.
The value of Planck constant is $6.63 \times 10^{-34} \mathrm{Js}$. he velocity of light is $3.0 \times 10^{8} \mathrm{~m} \mathrm{~s}^{-1} .$ which value is closest to the wavelength in nanometres of a quantum of light with frequency of $8 \times 10^{15} \mathrm{~s}^{-1}$ ? (a) $4 \times 10^{1}$ (b) $3 \times 10^{7}$ (c) $2 \times 10^{-25}$ (d) $5 \times 10^{-18}$
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Ishu K.
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