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Consider the following statements regarding the Heat Budget.
- Roughly 70 percent of heat received from the sun is reflected back to space even before reaching the earth’s surface.
- The reflected amount of radiation by the Earth is called the albedo of the earth.
Which of the above statements is/are correct?
- a)1 only
- b)2 only
- c)Both 1 and 2
- d)Neither 1 nor 2
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
Consider the following statements regarding the Heat Budget. Roughly 7...
The earth as a whole does not accumulate or loose heat. It maintains its temperature. This can happen only if the amount of heat received in the form of insolation equals the amount lost by the earth through terrestrial radiation. Consider that the insolation received at the top of the atmosphere is 100 percent. While passing through the atmosphere some amount of energy is reflected, scattered and absorbed. Only the remaining part reaches the earth surface. Roughly 35 units are reflected back to space even before reaching the earth’s surface. Of these, 27 units are reflected back from the top of the clouds and 2 units from the snow and ice-covered areas of the earth. The reflected amount of radiation is called the albedo of the earth.
The remaining 65 units are absorbed, 14 units within the atmosphere and 51 units by the earth’s surface.
The remaining 65 units are absorbed, 14 units within the atmosphere and 51 units by the earth’s surface.
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Consider the following statements regarding the Heat Budget. Roughly 7...
Understanding the Heat Budget Statements
The question presents two statements related to the Earth's heat budget, focusing on solar radiation and albedo. Let's break down each statement for clarity.
Statement 1: 70 Percent of Heat Reflected Back to Space
- This statement is incorrect. Approximately 30 percent of the solar radiation that reaches the Earth is reflected back into space, not 70 percent. This reflected radiation contributes to the overall energy balance of the planet.
Statement 2: Reflected Radiation and Albedo
- This statement is correct. The term "albedo" refers to the measure of reflectivity of a surface, specifically how much solar radiation is reflected back into space by the Earth. The Earth's average albedo is about 30 percent, meaning that this portion of incoming solar energy is reflected rather than absorbed.
Conclusion
- Since only the second statement is accurate, the correct answer is option B (2 only).
Understanding these concepts is essential for comprehending Earth's climate system and energy balance. Albedo plays a crucial role in influencing temperature and weather patterns, as variations in reflectivity can significantly impact the amount of heat absorbed by the Earth's surface.
The question presents two statements related to the Earth's heat budget, focusing on solar radiation and albedo. Let's break down each statement for clarity.
Statement 1: 70 Percent of Heat Reflected Back to Space
- This statement is incorrect. Approximately 30 percent of the solar radiation that reaches the Earth is reflected back into space, not 70 percent. This reflected radiation contributes to the overall energy balance of the planet.
Statement 2: Reflected Radiation and Albedo
- This statement is correct. The term "albedo" refers to the measure of reflectivity of a surface, specifically how much solar radiation is reflected back into space by the Earth. The Earth's average albedo is about 30 percent, meaning that this portion of incoming solar energy is reflected rather than absorbed.
Conclusion
- Since only the second statement is accurate, the correct answer is option B (2 only).
Understanding these concepts is essential for comprehending Earth's climate system and energy balance. Albedo plays a crucial role in influencing temperature and weather patterns, as variations in reflectivity can significantly impact the amount of heat absorbed by the Earth's surface.
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Consider the following statements regarding the Heat Budget. Roughly 70 percent of heat received from the sun is reflected back to space even before reaching the earth’s surface. The reflected amount of radiation by the Earth is called the albedo of the earth.Which of the above statements is/are correct?a)1 onlyb)2 onlyc)Both 1 and 2d)Neither 1 nor 2Correct answer is option 'B'. Can you explain this answer?
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Consider the following statements regarding the Heat Budget. Roughly 70 percent of heat received from the sun is reflected back to space even before reaching the earth’s surface. The reflected amount of radiation by the Earth is called the albedo of the earth.Which of the above statements is/are correct?a)1 onlyb)2 onlyc)Both 1 and 2d)Neither 1 nor 2Correct answer is option 'B'. Can you explain this answer? for UPSC 2025 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Consider the following statements regarding the Heat Budget. Roughly 70 percent of heat received from the sun is reflected back to space even before reaching the earth’s surface. The reflected amount of radiation by the Earth is called the albedo of the earth.Which of the above statements is/are correct?a)1 onlyb)2 onlyc)Both 1 and 2d)Neither 1 nor 2Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for UPSC 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following statements regarding the Heat Budget. Roughly 70 percent of heat received from the sun is reflected back to space even before reaching the earth’s surface. The reflected amount of radiation by the Earth is called the albedo of the earth.Which of the above statements is/are correct?a)1 onlyb)2 onlyc)Both 1 and 2d)Neither 1 nor 2Correct answer is option 'B'. Can you explain this answer?.
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