Home › UPSC CSE › Geography › Physical Geography › Within how many years of the Big Bang did temper…
Within how many years of the Big Bang did temperature drop to 4,500 K, forming atomic matter?
A200,000
B500,000
C800,000
D300,000
Answer & Solution
Correct answer: D. 300,000
1. The universe then became transparent.
2. It took 300,000 years.
3. Expansion has continued since.
_Source: NCERT Class 11 Fundamentals of Physical Geography, Chapter 2, The Origin and Evolution of the Earth._
Related questions
How many check-dams did Bhujpur villagers build in 1989?Bhujpur's check-dams were built on which river and its tributaries?Bhujpur, where villagers built check-dams in 1989, is in which region?Watering plants through narrow tubes delivering water at the base of the plant is:Bawris, now being revived, were traditional structures for:Using rainwater to recharge groundwater is called:Excessive rains cause floods, while absence of rain results in:Most Indian farmers depend on which source to irrigate crops?