thermal radiation from the earth’s surface peaks at a wavelength of approximately 10 ?m. What is the energy of a photon at this wavelength? A. 2.4 eV B. 1.2 eV C. 0.24 Ev D. 0.12 eV

Solution 4P Introduction: The relationship between energy of photon and wavelength is given as, Energy = hc Wavelength …..(1). Here, h is Planck’s constant and c is the speed of light. Thus, energy and wavelength are inversely related. Step 1: Given wavelength = 10 m 6 6 = 10×10 m (since 1 m= 10 m 5 = 10 m 34 Planck’s constant , h = 6.63×10 Js 8 Speed of light , c = 3×10 m/s