History Review of lessons 151-154

I studied the Electron microscope, the FM Radio, Nuclear Fission, and the Transistor.

Electron Microscope, invented 1931.

The Electron Microscope, was invented by Leo Szilard, in 1931, but he never built it. It wasn’t until 1933 that the first electron microscope was built by Ernst Ruska. The electron microscope is a very high powered microscope that uses electrons instead of light. The electron microscope lets us see things as small as viruses and their behavior.

FM Radio, invented 1933.

The FM Radio, was invented in 1933 by Edwin Armstrong, who was born in New York, in 1890. FM radio is a lot less sensitive to interference, which means it can be transmitted longer distances then AM radio. FM radio is responsible for the rising popularity of country music and conservative talk shows.

Nuclear Fission, invented 1939.

Nuclear Fission, was invented by two men, Read Rutherford, and Leo Szilard. Rutherford split atoms in 1932, Szilard demonstrated nuclear fission in 1939, and finally in 1945 the first atomic bomb was made. Only two atomic bombs have ever been used and that was during WWII. The first Hydrogen bomb exploded in 1952.

Transistor, invented in 1947.

The Transistor, was invented in 1947 at bell labs by three men, John Bardeen, William Shockley, and Walter Brattain. Transistor computers came out in 1950, and transistor radios came out in 1955. By the end of the 1960’s transistors where selling by the billions. An iphone today has about 20 million transistors and the computer has a few billion.

Thanks for reading! If I messed up anywhere let me know in the comments below ⬇⬇⬇

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