A boy claps his hand once every second and hears the echo from a distant building. He hears the echo of each clap midway between it and the next clap. If v=340m/s, what is the distance of building from the boy?​

When you see distant streetlights through smog, they look dimmer and redder than they do normally. but when you see the same streetlights through fog or falling snow, they look dimmer but not redder. use your knowledge of the interstellar medium to discuss the relative sizes of the particles in smog, fog, and snowstorms compared to the wavelength of light.