Question 1: Define 'emission' in the context of black body radiation.

Answer: Emission in black body radiation refers to the process by which an object releases electromagnetic radiation as a result of its temperature.

Question 2: Explain why hotter objects emit more radiation than cooler objects.

Answer: Hotter objects emit more radiation because increasing temperature increases the energy of the molecules, leading to more electromagnetic radiation being emitted.

Question 3: What is the name of the law that describes the relationship between the temperature of a black body and the amount of radiation it emits?

Answer: Stefan-Boltzmann Law

Question 4: Calculate the total power radiated per unit area (in watts per square meter) by a black body at a temperature of 6000 K, given that the Stefan-Boltzmann constant is 5.67 × 10^-8 W/m^2K^4.

Answer: P = σT^4 = (5.67 × 10^-8) × (6000)^4 = 5.67 × 10^-8 × 1.296 × 10^15 ≈ 73536 W/m^2

Question 5: Which of the following objects emits radiation primarily due to its high temperature? A) A blue sky B) A hot metal rod C) A piece of ice D) A green leaf

Answer: B) A hot metal rod

Question 6: Fill in the blank: The color of a black body shifts from red to blue as its temperature __________.

Answer: increases

Question 7: Describe one practical application of understanding emission in industry or technology.

Answer: Understanding emission allows industries to design better thermal imaging devices, improve infrared heaters, and develop more efficient solar panels by optimizing how objects emit radiation based on their temperature.

Question 8: Identify three safety precautions when working with high-temperature objects that emit radiation.

Answer: Wear heat-resistant gloves and safety goggles, use appropriate shielding to prevent burns, and ensure proper ventilation to avoid inhaling any fumes or gases.

Question 9: Explain how the emission of radiation from the Sun affects Earth's climate.

Answer: The Sun emits radiation through emission processes driven by its high temperature. This radiation reaches Earth, providing energy that drives climate and weather patterns. Variations in solar emission can influence global temperatures and climate change.

Question 10: What is the primary reason why different objects appear to emit different colors of light?

Answer: Different objects emit different colors because they are at different temperatures, causing their emitted radiation to peak at different wavelengths according to Wien's Law.