49. Which explains why the sky is blue? A. Blue light is not easily scattered by the atmosphere. B. Blue light is not easily absorbed by the atmosphere. C. Air molecules scatter blue light more readily than other colors. D. Blue light is reflected off the world's oceans into the atmosphere. 50. Which of the following is true about radio waves? A. It is an electromagnetic wave with the longest wavelength within visible light range. B. It is an electromagnetic wave with the longest wavelength outside the visible light range. C. It is an electromagnetic wave with the shortest wavelength within visible light range. D. It is an electromagnetic wave with the shortest wavelength outside visible light range