GED Science TestPhysical ScienceHard
A scientist is designing a new type of solar panel. They want to use materials that efficiently absorb energy from the sun to convert it into electricity. Which part of the electromagnetic spectrum is primarily responsible for heating the Earth and is therefore a key target for solar energy technologies?
- AGamma rays
- BVisible light
- CUltraviolet (UV) radiation
- DInfrared (IR) radiation
Show answer & explanationAnswer & explanation
Correct answer: D. Infrared (IR) radiation
While visible light contributes to solar panel efficiency and UV can cause damage, infrared radiation is primarily responsible for the heating effect of sunlight on Earth's surface and is a significant component of the solar spectrum that solar panels aim to capture, especially for thermal applications, but also for photovoltaic cells.
Why the other options are wrong
- A. Gamma rays are high-energy, dangerous, and a very small component of solar radiation, not primarily responsible for heating.
- B. Visible light is important for solar panels, but infrared radiation carries a substantial amount of the sun's energy and is most responsible for the heating sensation.
- C. UV radiation causes sunburn and can damage materials, but visible light and IR are more significant for direct heating and energy conversion in solar cells.
Electromagnetic Spectrum
The range of all types of electromagnetic radiation, ordered by wavelength or frequency.
- Includes radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.
- All travel at the speed of light in a vacuum.
- Differ in wavelength, frequency, and energy.
- Infrared radiation is associated with heat.
Memory trick: Radio's Relaxed, Gamma's Got Guts.