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QPage 440: Q6: HC Verma: Concepts of Physics - Volume 2 The Nucleus Page 440: Q6 Solution: What is the difference between cathode rays and beta rays? When …

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often treat cathode rays and beta rays as different particles and look for intrinsic differences (e.g., charge, mass, speed); however both are simply electrons with identical charge and mass, so in free space they cannot be distinguished without knowing their source.

What is the difference between cathode rays and beta rays? When the two are travelling in space, can you make out which is the cathode ray and which is the beta ray?

Step-by-Step Verified Solution

**Answer:** Cathode rays are electrons emitted by a heated filament (thermionic emission), while beta rays are electrons emitted by a nucleus during beta decay. When travelling in space, they cannot be distinguished by their properties alone (both are electrons), but their origin differs. **Step-by-Step Explanation:** Cathode rays are streams of electrons produced in a vacuum tube by thermionic emission or field emission. Beta rays are high-speed electrons emitted from the nucleus during radioactive beta decay. Both have the same charge and mass (they are both electrons). In space, if you only observe the particles, you cannot tell whether they originated from a cathode or a nucleus. The distinction is in their **source**, not in their intrinsic properties[citation:1].

All Questions in this Chapter

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