Gizmos-Radiation (Exams and Answers) 2021
1. The Sun is millions of kilometers away. How can heat from the Sun get here? Answers will vary. [In fact, the Sun is so hot that it glows, and that light (radiation) heats the Earth.] 2. If you look inside an electric stove or toaster oven, how can you tell whether it’s turned on? The burner or heating element will glow. [These items glow because they are very hot, just as the filament in an incandescent bulb does.] Gizmo Warm-up In the Radiation Gizmo, you can focus the light of a super-powerful flashlight upon a kernel of popcorn and see what happens. The lens, which focuses the light, can be moved to the left or right. 1. The Temperature slider controls the heat of the metal filament inside the light. Scientists use the Kelvin scale to measure the temperature of a light filament. It is like the Celsius scale except 0 K (absolute zero) is the coldest anything can ever be. Slowly move the Temperature slider all the way to the right. What happens? The color of the light changes from red to orange to yellowish-white. The light energy emitted by the flashlight is called radiation.
Información del documento
- Subido en
- 8 de septiembre de 2021
- Número de páginas
- 4
- Escrito en
- 2021/2022
- Tipo
- Examen
- Contiene
- Preguntas y respuestas
