Solving NEET 2025: Radius and Velocity Ratios in Atomic Models (Step-by-Step)

 Master the Relationship Between Orbit Radius, Velocity, and Quantum Numbers!

Are you preparing for NEET 2025? Atomic physics is a high-scoring section, and questions regarding Bohr’s model are a staple in every paper. In this tutorial, we solve a specific, "ability-testing" problem that explores how the radius (r) and velocity (v) of a particle depend on the principal quantum number (n).

What You Will Learn in This Video:

• Bohr's Postulates in Action: Learn how to apply Bohr’s quantization of angular momentum (L = mvr to set up your equations [00:00:66].

• Centripetal Force & Orbits: See how the relation between centripetal force and the orbit radius (mv^2/r = Constant) helps simplify the math [00:20].

• Proportional Reasoning: We break down the step-by-step substitution to find that r \propto n^{2/3} and v \propto n^{1/3} [00:01:63].

• Elimination Strategy: Watch how to quickly identify the correct option (Option 4) by solving for just one variable first, saving you precious time during the exam [02:08].

• Why This Problem Matters: This specific question challenges your understanding of how basic mechanical laws (like force and circular motion) integrate with quantum physics. Mastering these "dependence on $n$" problems is essential for securing a top rank in NEET and JEE.

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NEET 2025 Dual nature of radiation and matter Photo electric effect Graph based question

 Understand the Dual Nature of Radiation and Matter through Simple Graphs!

Are you preparing for NEET 2026? Graphical questions are a high-scoring part of the physics syllabus, but they can be tricky if you don't know the core rules. In this video, we simplify a popular exam question about the Photoelectric Effect.

What You Will Learn in This Video:

• Intensity vs. Current: Why does increasing light intensity lead to more current? We explain the direct relationship between photons and electrons [00:24].

• Frequency vs. Current: Learn why increasing the frequency of light doesn't increase the photoelectric current once you are above the threshold [01:02].

• Threshold Frequency: A simple explanation of the minimum energy needed to release an electron from a metal surface [01:33].

• Spotting the Right Graph: We compare four different graphs to show you exactly how to pick the correct answer (Option A) in seconds [02:27].

Why Watch This Tutorial?

• No Complex Formulas: We focus on the logic and the "rules of the game" so you can remember them easily on exam day.

• NEET 2026 Focused: This content is specifically designed to help you tackle the current exam patterns for the Dual Nature of Radiation chapter.