Question

a student has a flashlight with a red filter. the student shines the flashlight at a clear glass of water. what will the student observe, and why? the red light will travel through both the air and the water because it is a transverse wave. the red light will not travel through the air or the water because it is not white light. the red light will travel only through the air because it is not white light. the red light will travel only through the water because it is a mechanical wave.

Explanation:

Step1: Understand the nature of light

Light is an electromagnetic wave (a type of transverse wave) and can travel through different transparent mediums. Air and water are both transparent to light (in general, for visible light under normal conditions).

Step2: Analyze each option

• Option 1: Light is not a mechanical wave. Mechanical waves require a medium (like sound waves in air or water waves on water surface) but light (electromagnetic wave) can travel in vacuum and through transparent media. So this option is wrong.
• Option 2: Light is not restricted to travel only through air. It can travel through other transparent media like water (as long as there are no strong absorbers). And the color of light (red in this case) does not determine the medium it can pass through in terms of air - only. So this option is wrong.
• Option 3: Light (red light here) can travel through both air and water (as they are transparent to it). The fact that it is not white light is not relevant to its ability to pass through air or water. White light is a combination of multiple colors. So this option is wrong.
• Option 4: Since light is a transverse wave (electromagnetic wave), and air and water are both transparent to red light (assuming no impurities that would strongly absorb red light), the red light will travel through both the air and the water.

Answer:

The red light will travel through both the air and the water because it is a transverse wave.