Notes For All Chapters – English Class 7
1. Introduction
- Dr. A. P. J. Abdul Kalam was a scientist and former President of India (2002–2007).
- He admired great scientists like Dr. C. V. Raman, who inspired young minds.
2. Dr. C. V. Raman’s Early Life
- Born in Tiruchirapalli, India, in 1888.
- A brilliant student interested in optical science (light) and acoustics (sound).
- Fascinated by colorful things like flowers, butterflies, and gems.
3. Curiosity and Discovery
- While traveling on a ship, Raman wondered why the sea and the sky are blue.
- He conducted experiments and discovered that light scatters due to water molecules.
- This discovery was named the “Raman Effect.”
4. Achievements of Dr. C. V. Raman
- Announced the Raman Effect in March 1928.
- Awarded the Nobel Prize for Physics in 1930, the first Asian to win this award.
- February 28, the day of his discovery, is celebrated as National Science Day in India.
- Elected a Fellow of the Royal Society in 1924 for his contributions to science.
5. Importance of the Raman Effect
- The discovery helped scientists understand light and its interaction with materials.
- It also helped determine the structure of about 2000 chemical compounds.
6. Qualities of a Great Scientist
- Raman believed that science requires independent thinking, curiosity, and hard work.
- He showed that expensive equipment is not necessary for great discoveries.
- His experiments used tools costing only 200 rupees.
7. Key Takeaways
- Great scientists always ask questions like “Why does this happen?” and “How can it be better?”
- Curiosity and determination are more important than resources.
- Science can find answers to nature’s mysteries with a questioning mind.
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