Which of the following pairs is/are correctly matched? Theory/Law Associated Scientist 1. Continental Drift Edwin Hubble 2. Expansion of Universe Alfred Wegener 3. Photoelectric Effect Albert Einstein Select the correct answer using the code given below: Code:

Only statement 3 is correctly matched. The continental drift theory was proposed by Alfred Wegener (1912), who argued continents once formed a single supercontinent Pangaea and later drifted apart [1]. The expansion of the Universe is attributed to observations by Edwin Hubble, who described galactic redshift and formulated Hubble’s law linking recession velocity with distance, indicating an expanding universe [2]. The photoelectric effect was explained by Albert Einstein, who introduced the concept of light quanta (photons) to account for the effect, a result that underpinned early quantum theory and earned him the Nobel Prize [3]. Therefore, only pair 3 is correct (option 2).

Sources

1. [1] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 7: Tectonics > 7.2. Continental Drift Theory > p. 95
2. [2] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 1: The Universe, The Big Bang Theory, Galaxies & Stellar Evolution > Doppler-Shift or Redshift and Blueshift > p. 3
3. [3] https://en.wikipedia.org/wiki/Albert_Einstein