Q. It becomes difficult to study X-rays from space because:
1.The Earth’s atmosphere reflects most of it.
2.Presence of low energy resolution in X-ray detectors
3.X-rays’ high energy makes it difficult to focus with lenses.
Which of the statements given above is/are correct?
Answer: C
Notes:
Explanation –
- Earth’s atmosphere absorbs most X-rays, not reflect them. X-rays are high-energy electromagnetic radiation, and the molecules in our atmosphere, particularly nitrogen and oxygen, absorb them. Hence, it becomes difficult to observe X-rays from space on the ground.
- Low energy resolution in X-ray detectors:Energy resolution refers to the ability of a detector to distinguish between X-rays of different energies. This is important for identifying the specific elements present in astronomical objects, as each element has a unique X-ray emission signature. Modern X-ray detectors used in space-based telescopes have high energy resolution, allowing for precise identification of elements.
- X-rays’ high energy makes it difficult to focus with lenses:X-rays have high energy and short wavelengths, making them challenging to manipulate with traditional lenses or mirrors used for visible light. Unlike visible light, X-rays are not easily refracted or reflected, requiring specialized techniques and instruments, such as X-ray telescopes with grazing incident mirrors, to focus and capture X-rays for scientific observations.
Source: Forum IAS
