This YouTube video delves into the impact that tourism can have on the environment.
This YouTube video delves into the impact that tourism can have on a country's economy.
This short online lesson discusses the planet Neptune.
This YouTube video will guide you through a fun activity where you will draw the earth's continents and oceans.
This online tutorial will explain the earth's shape and its hemispheres.
This YouTube video explores both passive and active solar energy.
There are many different processes and phenomena that emit electromagnetic radiation. Humans have taken advantage of many of these processes to develop technologies that use electromagnetic radiation.
Photoelectric materials emit electrons when they absorb light of a high-enough frequency.
When electromagnetic radiation is absorbed by a material the energy it carries has to go somewhere. When lower energy waves, like radio and infrared waves, are absorbed there can be an increase in temperature of the absorbing material. Higher energy waves, like x-ray and gamma waves, can actually permanently damage or change materials. Learn about the different types of electromagnetic waves and how their energies can influence their effects on objects.
The wavelength and frequency of a wave are related to one another by the speed of travel of the wave, which depends on the type of wave and the medium through which it is passing.