Question

The Principle of Uncertainty was introduced by:

• A. Broglie
• B. Avogadro
• C. Heisenberg
• D. Einstein

Hint:

Heisenberg's Uncertainty Principle is fundamental in quantum mechanics, establishing the limit on the precision of simultaneous measurements of certain pairs of properties, like position and momentum.

Answer 1

The Correct Option is C

• Option 1: Broglie - This is incorrect. Louis de Broglie introduced the concept of matter waves, not the principle of uncertainty.
• Option 2: Avogadro - This is incorrect. Amedeo Avogadro is known for Avogadro's law related to gases, but he did not contribute to the principle of uncertainty.
• Option 3: Heisenberg - This is the correct answer. The principle of uncertainty was introduced by Werner Heisenberg in 1927. It states that it is impossible to simultaneously know the exact position and momentum of a particle, which is a fundamental concept in quantum mechanics.
• Option 4: Einstein - This is incorrect. Albert Einstein made significant contributions to physics, particularly with the theory of relativity and the photoelectric effect, but he did not introduce the uncertainty principle.

Explanation: 

The principle of uncertainty was introduced by Werner Heisenberg in 1927. This principle asserts that the more precisely the position of a particle is known, the less precisely its momentum can be known, and vice versa. It is a cornerstone of quantum mechanics and has profound implications for the behavior of particles at microscopic scales.

Answer 2

The uncertainty principle has a specific mathematical form, the product of the uncertainty in position and the uncertainty in momentum is greater than or equal to Planck's constant divided by four pi, and checking who is credited with this exact relation points straight to the answer.

1. Broglie: De Broglie's relation connects a particle's wavelength to its momentum. This is a different equation with no statement about a limit on measuring position and momentum together.
2. Avogadro: Avogadro's relation connects gas volume to the number of molecules present, with no position or momentum terms in it at all.
3. Heisenberg: The position-momentum inequality is Heisenberg's own relation, published in 1927, and it says position and momentum cannot both be pinned down with unlimited precision at the same time. This is precisely the uncertainty principle.
4. Einstein: Einstein's photoelectric equation relates the energy of a photon to its frequency, which has no connection to a built-in limit on measuring two quantities at once.

Only the position-momentum inequality is Heisenberg's own contribution and defines the uncertainty principle.

So the correct answer is Heisenberg.