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Q141
(IAS/2006)
Science & Technology › Basic Science (Physics, Chemistry, Biology) › Astronomy and astrophysics
Answer Verified
What is the approximate mean velocity with which the Earth moves round the Sun in its orbit?
Result
Your answer:
—
·
Correct:
B
Explanation
The mean orbital speed of Earth around the Sun is approximately 30 km/s. Textbook data report the Earth travels at about 30 km (≈18.5 miles) per second, corresponding to roughly 107,182 km/h, for one complete revolution per year [1]. Precise values given in astronomical references quote the mean orbital velocity as about 29.7–29.8 km/s, which is routinely rounded to 30 km/s for practical purposes. Thus, among the given choices the value 30 km/s best represents the Earth's average orbital speed.
Sources
- [1] Certificate Physical and Human Geography , GC Leong (Oxford University press 3rd ed.) > Chapter 2: The Earth's Crust > The Earth's Revolution > p. 6
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