Questions and Answers
De atmosfeer speelt een cruciale rol in de ______ balans van de Aarde.
energie
De intensiteit van de straling wordt uitgedrukt in watts per vierkante ______.
meter
Het ______ van de straling is de totale energie die door een oppervlak wordt uitgezonden of geabsorbeerd gedurende een bepaalde tijd.
vermogen
De intensiteit van de zonnestraling op het aardoppervlak is ongeveer 1.000 ______.
Signup and view all the answers
De ______ balance op Aarde moet worden gehandhaafd om de bewoonbaarheid van de planeet te garanderen.
Signup and view all the answers
De intensiteit van de straling wordt uitgedrukt in ______ per vierkante meter.
Signup and view all the answers
De atmosfeer absorbeert de straling en zendt haar weer in alle ______ uit.
Signup and view all the answers
Een deel van de straling verdwijnt naar de ______.
Signup and view all the answers
Met behulp van satellieten kun je deze straling ______.
Signup and view all the answers
De energie die de aarde aan zonnestraling absorbeert is gemiddeld gelijk aan de energie die de aarde ______.
Signup and view all the answers
Study Notes
Physics: Understanding Energy Flows on Earth
Earth receives energy from the sun and also sends energy out, with different intensiveities and wavelengths. The intensity of the radiation can be calculated using the formula I = P/A, where I is the intensity of the radiation in W/m², P is the power of the radiation in W, and A is the surface area in m². The sun's energy, being hot, has relatively short wave lengths. The Earth and the atmosphere also emit energy, but with longer wave lengths that are cooler. The atmosphere absorbs this radiation, but it is also reflected and scattered.
Solar Energy and Its Impact
The sun is the primary source of energy on Earth. The energy it emits is referred to as solar radiation. The intensity of this radiation is highest at the surface of the Earth, where it reaches approximately 1,000 watts per square meter. This energy is distributed over the entire surface of the Earth, not just the land, but also the oceans. The solar radiation is made up of a mixture of different wavelengths, with the majority being in the visible range.
Earth's Energy Emission
The Earth, however, does not just receive energy. It also emits energy, which is known as terrestrial radiation. This radiation is emitted by the Earth's surface, including the land, oceans, and atmosphere. The Earth's energy emission is primarily in the form of infrared radiation, which is longer than visible light. This radiation is emitted by all objects with a temperature above absolute zero.
The Role of the Atmosphere
The atmosphere plays a crucial role in the Earth's energy balance. It absorbs some of the incoming solar radiation, primarily in the ultraviolet region, and re-emits it in the form of infrared radiation. This process is known as the greenhouse effect. The atmosphere also scatters and reflects some of the solar radiation. The scattering of solar radiation is responsible for the blue color of the sky.
The Concept of Intensity and Power
The intensity of the radiation is a measure of the energy per unit area. It is expressed in watts per square meter (W/m²). The power of the radiation is the total energy emitted or absorbed by a surface over a certain period of time. It is expressed in watts (W). The intensity of the solar radiation at the Earth's surface is approximately 1,000 W/m². This is the power per unit area that the Earth receives from the sun.
Energy Balance
The energy balance on Earth is a delicate one. The Earth receives energy from the sun and also emits energy. The energy balance must be maintained to ensure the planet's temperature remains habitable. Any imbalance can lead to either global warming or cooling, which can have significant consequences for life on Earth.
In conclusion, physics is the study of energy and its interactions. In the context of Earth's energy system, we see the sun as the primary source of energy, with the Earth both receiving and emitting energy. The atmosphere plays a crucial role in this energy balance, absorbing, scattering, and reflecting solar radiation. Understanding these interactions is crucial for understanding the Earth's climate system and its potential for future changes.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
