Q.Which of the following are true? (Note: more than one of the given options may be correct.)
You're viewing a preview — the full solution, concept, methods & PYQ mapping are locked.
Start your 14-day free trial to unlock the full solution →Polar satellites orbit the Earth in a north-south direction, passing over the poles, while geostationary satellites orbit in the equatorial plane from west to east, matching Earth's rotation. Options (A) and (C) are true.
Understanding the different types of satellite orbits is crucial for their applications. Satellites are placed into specific orbits to achieve particular objectives, and their orbital direction is a key characteristic. The Earth rotates from west to east. This fundamental fact dictates the orbital direction for satellites that need to maintain a fixed position relative to the ground.
Let's break down the characteristics of polar and geostationary satellites.
1. Polar Satellites
Polar satellites are designed to orbit the Earth at a high inclination, typically close to relative to the equatorial plane. This means their orbital path takes them over or very close to the Earth's geographic poles.
- Direction of Orbit: As they pass over the poles, their motion relative to the Earth's surface is primarily in a north-south direction.
- Purpose: This type of orbit is ideal for Earth observation, weather monitoring, environmental sensing, and reconnaissance. As the satellite completes an orbit, the Earth rotates beneath it, allowing the satellite to scan different strips of the Earth's surface with each pass. Over several orbits, a polar satellite can cover the entire globe.
Let's evaluate the options related to polar satellites:
- (A) A polar satellite goes around the earth's pole in north-south direction. This statement accurately describes the characteristic orbit of a polar satellite.
- (D) A polar satellite goes around the earth in east-west direction. This statement is incorrect. Polar satellites orbit north-south.
2. Geostationary Satellites
Geostationary satellites are a specific type of geosynchronous satellite. They are placed in a circular orbit directly above the Earth's equator at a very specific altitude (approximately above the Earth's surface).
- Orbital Period: The key feature of a geostationary satellite is that its orbital period is exactly hours, which matches the Earth's rotational period.
- Direction of Orbit: For the satellite to appear stationary from a point on the Earth's surface, it must orbit in the same direction as the Earth's rotation. The Earth rotates from west to east. Therefore, a geostationary satellite must also orbit from west to east. …
Unlock everything free for 14 days
- Full step-by-step solutions
- Concept-first explanations
- Methods, shortcuts & mistakes
- PYQ mapping + timed mock tests
Full access for 14 days. No credit card required.