Multiple choice

Directions: The following question contains paragraph with sentence or phrase missing indicated parenthetically. From the alternatives, select the sentence or phrase that best provides the missing link.

In 1932, Carl David Anderson discovered the first anti-particle - the positron. By the 1950s the anti-proton and the anti-neutron had been discovered. The importance of these discoveries was not just the fact that a scientific theory had been proven. ( _____ ). This energy of mass annihilation is known as photon energy and it promises to be a major source for our energy requirements in the very near future.

  1. More importantly, a new and unprecedented form of energy had been discovered.

  2. It was rather initiation into a new era and a new definition of energy.

  3. It opened a Pandora's Box for future energy requirements.

  4. The importance was rather in finding a new source of energy.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

(1) “This energy of mass annihilation” is the clue.

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