What is called the time required for the satellite to complete one rotation?

RRB Nsg. Superintendent 21 July 2019 (shift 1st)

General Knowledge

Medium

Appeared in: RRB Nsg. Superintendent 21 July 2019 (shift 1st)

Explanation

'Period of revolution', which is the specific scientific term for the time an object takes to complete one full orbit around another.
The question uses the word 'rotation', but the context of a satellite completing a path around a planet refers to 'revolution'.
Rotation is the spinning of an object on its own axis (like Earth's 24-hour day).
Revolution is the orbiting of one object around another (like Earth's 365-day year around the Sun).

Option A: Force is an interaction (a push or pull) and does not have a 'period' in this context. It's a concept from dynamics, not a measure of time for an orbit.
Option B: This term is too general. While an orbit is a form of motion, 'Period of revolution' is the precise and specific term used in physics and astronomy.
Option C: Momentum is a physical quantity (mass × velocity) that measures an object's motion. It is not a time interval.

Visual 1: Diagram - An infographic clearly illustrating the difference between Earth's rotation on its axis (causing day/night) and its revolution around the Sun (causing seasons). A satellite can be shown doing the same around the Earth.
Visual 2: Formula - A visual card showing the formula for the period of revolution: T = 2πr / v, with each variable (T, r, v) clearly defined.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Orbital Mechanics: Period of Revolution as background academic context rather than a clinical decision trigger.
This is a fundamental concept in physics and general science, not a clinical nursing question.
Understanding periodic events is a core scientific skill. For example, in biology, chronobiology studies periodic (cyclic) phenomena in living organisms, such as circadian rhythms, which are crucial for health and disease.
What if the question asked for the time it takes for a satellite to spin once on its axis? In that case, the answer would be its 'rotational period' or 'period of rotation'.

How to Approach the Question

Step 1: Analyze the question to identify the key action: a satellite completing 'one rotation'.
Step 2: Consider the context. A satellite's primary motion relative to a planet is orbiting around it.
Step 3: Recognize the potential ambiguity between 'rotation' (spinning) and 'revolution' (orbiting). In astronomy, orbiting is called revolution.
Step 4: Evaluate the options based on this understanding. 'Period of revolution' is the specific term for the time to complete one orbit.
Step 5: Eliminate the other options. 'Force' and 'momentum' are incorrect physical concepts for a time period, and 'motion' is too general.
Step 6: Conclude that 'Period of revolution' is the most accurate and specific answer despite the question's use of the word 'rotation'.

Concept Tested & Keywords

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