Quick Revision Notes

Class: 9th English (Beehive)

About the Chapter: This chapter is a short biographical sketch of Albert Einstein, a renowned theoretical physicist.
Core Theme: It highlights Einstein not just as a scientific genius (a "mind that works wonders"), but also as a human being with interests in music, world peace, and humanitarian causes, showing that brilliance can coexist with simplicity and empathy.

Birth: March 14, 1879, in the German city of Ulm.
Early Childhood:
- Did not learn to speak until he was two and a half years old, and even then, he spoke everything twice.
- Considered a "boring" child by his playmates; his mother thought he was a freak because his head was too large.
- Hated the regimented discipline of school and often clashed with his teachers.
Education & Move:
- Left school in Munich at age 15 due to stiff discipline and joined a school in Switzerland where teaching was more liberal.
- Graduated from the University of Zurich in 1900 and initially struggled to find a job.
Professional & Scientific Breakthrough (1902–1905):
- Secured a job as a technical expert in the patent office in Bern.
- Secretly developed his own ideas and published his revolutionary papers in 1905.
- Key Publications (1905):
  1. Special Theory of Relativity
  2. Famous mass-energy equivalence equation: E = mc^2

Mass-Energy Equivalence:
- E = mc^2
- Where:
  - E = Energy
  - m = Mass
  - c = Speed of light in a vacuum (approx. 3 x 10^8 m/s)
- Significance: It proved that mass and energy are interchangeable.

Marriage & Family:
- Fell in love with Mileva Maric at the University of Zurich because she, too, was a clever creature who disliked "philistines" (people who disliked art, literature, or music).
- Married in 1903; had two sons, but the marriage eventually faltered, leading to a divorce in 1919.
- Married his cousin Elsa the same year.
Passions:
- Deep love for music, particularly playing the violin, which he maintained throughout his life.
Global Citizen & Humanitarian:
- After Hitler came to power in Germany in 1933, Einstein emigrated to the United States.
- Wrote a warning letter to US President Franklin D. Roosevelt in 1939 about the destructive potential of an atomic bomb.
- Deeply shocked by the devastation of Hiroshima and Nagasaki, he launched a campaign for world peace and the formation of a world government.

Freak: A word used disapprovingly to refer to someone who is unusual in appearance or behavior.
Stutter: To speak with involuntary pauses or repetitions (Einstein did this as a child).
Philistines: A term used by Einstein for people who do not like art, literature, or music.
Blunder: A careless mistake.
Falter: To lose strength or purpose (used in the context of his first marriage).
Emigrate: To leave one's native country to live in another.

Short Answer Questions (SAQs): Focus on why Einstein's playmates called him "Brother Boring," why he left school in Munich, and why he wrote a letter to President Roosevelt.
Long Answer Questions (LAQs): Prepare to write a character sketch of Albert Einstein, highlighting how his scientific genius was matched by his vision for world peace.
Remember the Equation: Be ready to state what E = mc^2 stands for when asked about his 1905 papers.