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🎓 UG TRB Physics | What are Magic Numbers? | Detailed Explanation with Questions

Are you preparing for the UG TRB Physics 2026 exam? This session by Professor Academy focuses on a core topic from Unit 5: Atomic and Nuclear Physics—Magic Numbers. Understand why certain nuclei are exceptionally stable and how this concept fits into the Nuclear Shell Model.

Video Overview
Magic numbers are specific counts of nucleons (protons or neutrons) that result in highly stable atomic nuclei. This video provides a conceptual breakdown, historical context, and practical examples of why these numbers matter in nuclear physics.

In this video, you will learn:

Definition of Magic Numbers: Understanding how specific numbers of protons or neutrons lead to higher nuclear stability [00:16].

Nuclear Shell Model: The relationship between magic numbers and closed nuclear shells, similar to electron configurations in atoms [01:00].

The Magic Numbers List: Memorizing the key values: 2, 8, 20, 28, 50, 82, and 126 [02:41].

Doubly Magic Nuclei: Examples of nuclei where both protons and neutrons are magic numbers, such as Helium-4, Oxygen-16, and Lead-208 [06:58].

Evidence and Abundance: Why isotopes with magic numbers are more abundant in nature and how they serve as the end products of radioactive decay series [07:26].

PYQ Analysis: Solving direct exam questions from previous years to identify valid magic number sequences [08:34].

🔗 Important Links
📌 Physics WhatsApp Community:
https://chat.whatsapp.com/GXEoNXmU9QY...

🚀 UG TRB 2026 – Online Course Details

Course Fees: With Books: 12,000 | Without Books: 9,000

Instalments: 3 Online Instalments available.

Medium: Bilingual (Tamil and English explanation with English medium materials).

📱 Professor Academy App:
👉 Play Store: https://play.google.com/store/apps/de...
👉 App Store: https://apps.apple.com/us/app/profess...

📞 Contact: 7070701009 | 7070701005 | 8124408794 | 7550100920

📌 Video Timestamps:
00:00:16 – What are Magic Numbers?

00:00:45 – Origin: Maria Goeppert Mayer and the Shell Model

00:02:41 – The list of Magic Numbers (2, 8, 20, 28, 50, 82, 126)

00:04:18 – Examples: Inert Gases and Nuclear Configuration

00:06:14 – Isotopic Abundance (Tin, Calcium, Lead)

00:06:58 – Doubly Magic Nuclei explained

00:07:42 – Radioactive Decay Series and End Products

00:08:34 – PYQ: Identifying non-magic number sets

00:09:25 – MCQ: Spotting the wrong magic number

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