How does uncertainty principle explain lasers, transistors, internet and computers?

It doesn't.

Laser is based on photons being bosons rather than fermions, transistors have to do with non-linear response (non-Ohmic circuit behaviour), internet and computers could have been developed if the world were classical, AFAIK. It plays a part in Zenner diodes and the like --tunnel effect-- AFAIR, but not singlehandedly, let's say.

HUP does not "explain" these things AFAIK. Who told you that?

HUP, along with other paradigms of Quantum Mechanics, are the foundation of a very tall building.
Lasers and transistors would be about 30 stories up, with a lot of 'construction' in between.

13 hours ago, joigus said:

It doesn't.

Laser is based on photons being bosons rather than fermions, transistors have to do with non-linear response (non-Ohmic circuit behaviour), internet and computers could have been developed if the world were classical, AFAIK. It plays a part in Zenner diodes and the like --tunnel effect-- AFAIR, but not singlehandedly, let's say.

HUP does not "explain" these things AFAIK. Who told you that?

Michio Kaku mentions it.

15 minutes ago, Brainee said:

Michio Kaku mentions it.

Can you give us a link or quote to evaluate?

44 minutes ago, Brainee said:

Michio Kaku mentions it.

Michio Kaku has a tendency to oversell things while diluting the science for lay audiences.

In this article in NYT, In a Parallel Universe, Another You - The New York Times (nytimes.com), Michio Kaku said,

Quote

Quantum theory is based on what is known as Heisenberg’s uncertainty principle

If so, and the world is quantum mechanical, the uncertainty principle explains not only "lasers, transistors, internet and computers", but everything in the world.

HUP is part of the foundations of QM, and a very important one. But you cannot get all the richness of results of QM from HUP alone.

It's like saying that all of Euclidean geometry can be obtained from the pythagorean theorem, or all of art from mastering perspective.

"Quantum theory is based on what is known as Heisenberg’s uncertainty principle" like Euclidean geometry is based on Pythagorean theorem.