a beam of light is traveling through a medium at 200,000 km/s. it enters a different medium and speeds up to…

a beam of light is traveling through a medium at 200,000 km/s. it enters a different medium and speeds up to almost 250,000 km/s. finally, it enters a third medium and halts.\nwhat were the media the light traveled through, in order?\n○ liquid, opaque solid, gas\n○ opaque solid, gas, liquid\n○ gas, liquid, opaque solid\n○ liquid, gas, opaque solid

a beam of light is traveling through a medium at 200,000 km/s. it enters a different medium and speeds up to almost 250,000 km/s. finally, it enters a third medium and halts.\nwhat were the media the light traveled through, in order?\n○ liquid, opaque solid, gas\n○ opaque solid, gas, liquid\n○ gas, liquid, opaque solid\n○ liquid, gas, opaque solid

Answer

Brief Explanations:

To solve this, we recall the speed of light in different media: light travels slowest in solids, faster in liquids, and fastest in gases (in a vacuum it's fastest, but among these media, gas is faster than liquid, liquid faster than solid). Also, an opaque solid would stop light (halt it).

  1. First medium: speed 200,000 km/s – this is slower than gas (where light is faster) but faster than solid. So likely liquid (since liquid is slower than gas, faster than solid).
  2. Second medium: speeds up to ~250,000 km/s – gas is faster than liquid, so this should be gas.
  3. Third medium: light halts – opaque solid (since opaque solids don't transmit light, they stop it).

So the order is liquid (first), gas (second), opaque solid (third), which matches the option "liquid, gas, opaque solid".

Answer: D. liquid, gas, opaque solid (assuming the options are labeled A to D with D being this option; if the last option is the correct one as per the list, then the answer is the last option: liquid, gas, opaque solid)