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Luminous and Non-Luminous Objects Video Lecture | Science Olympiad Class 7
FAQs on Luminous and Non-Luminous Objects Video Lecture - Science Olympiad Class 7
| 1. What are luminous objects? |  |
Ans. Luminous objects are those that emit their own light. Examples include the sun, stars, fireflies, and light bulbs. These objects produce light through various processes, such as nuclear fusion in stars or electrical energy in bulbs.
| 2. What are non-luminous objects? | |
Ans. Non-luminous objects do not produce their own light; instead, they reflect light from luminous sources. Examples include the moon, a book, and a chair. These objects are visible only when illuminated by a source of light.
| 3. How do we see non-luminous objects? | |
Ans. We see non-luminous objects because they reflect light that comes from luminous sources. When light from a luminous object strikes a non-luminous object, it bounces off and enters our eyes, allowing us to perceive the shape and color of the non-luminous object.
| 4. Can luminous objects become non-luminous? | |
Ans. Yes, luminous objects can become non-luminous if they stop emitting light. For example, a light bulb that is turned off no longer emits light and appears as a non-luminous object. Similarly, a star that exhausts its fuel may eventually stop shining.
| 5. Why is the sun considered a luminous object? | |
Ans. The sun is considered a luminous object because it generates its own light and heat through nuclear fusion reactions occurring in its core. This process produces an immense amount of energy, which is emitted as light, making the sun the primary source of light for our planet.
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