Please help with the solution.

7. A cadmium telluride (CdTe) solar cell has an energy band gap Eg = 1.49 eV. A. What wavelengths of light will the solar cell absorb? B. How might you improve the efficiency (Peled Psolar) of the solar cell? 8. According to NASA, the meteorite that disintegrated over Russia in 2013 had a mass of 12,000 metric tons and traveled at 19 km/s (40,000 mph).. A. Find the kinetic energy in J. B. Big explosions are usually reported in tons of TNT, where 1 ton TNT = 4.18 GJ. Find the energy of the meteorite in tons of TNT. (Interesting note: The Hiroshima atomic bomb was 15 ktons of TNT)