Conceptual Questions for Class 12 Physics Chapter 13 Nuclei

Conceptual Questions for Class 12 Physics Chapter 13 Nuclei

Here we are providing conceptual questions for Class 12 Physics Chapter 13 Nuclei. Students are suggested to go through each and every question for better understanding.

Q.1. What is the ratio of the nuclear densities of two nuclei having mass numbers in the ratio 1:4?

Solution. As the nuclear density is independent of mass number, so the ratio of nuclear densities of the two given nuclei is 1: 1.

Q.2. What does exactly make heavy nuclei unstable?

Solution. Heavy nuclei are unstable due to the presence of large repulsive forces exerted between a large numbers of protons.

Q.3. Why is the number of neutrons in heavier nuclei more than the number of protons?

Solution. In a heavier nucleus, the force of repulsion between protons is appreciable due to the presence of a large number of protons. In order to exert large attractive nuclear force and hence to maintain stability of the nucleus, more neutrons become necessary for a heavier nucleus.

Q.4. Why is the density of a nucleus much more than that of the atoms?

Solution. The nuclear size is of the order of 10^-14 m and atomic size is of the order of 10^-10 m. So atomic size is 10⁴ times the nuclear size while atomic mass is slightly greater than nuclear mass due to the presence of electrons. Hence nuclear density is much greater than atomic density.

Q.5. Why is the mass of a nucleus always less than the sum of the masses of its constituents, neutrons and protons?

Solution. When nucleons approach each other to form a nucleus, they strongly attract each other. Their potential energy decreases and becomes negative. It is this potential energy which holds the nucleons together in the nucleus. The decrease in potential energy results in the decrease in the mass of the nucleons inside the nucleus.

Q.6. Electrons cannot be a part of a nucleus, but protons can be a constituent part of it. Why?

Solution. This is because of the fact that the de-Broglie wavelength of electrons is larger than the size of the nucleus while that of protons is smaller than the size of the nucleus.

Q.7. What is the difference between a photon and a neutrino?

Solution. A photon is one quantum of electromagnetic radiation having zero rest mass, no charge, zero spin and no antiparticle. It has a fixed energy which depends on frequency. A neutrino is an elementary particle that accompanies a β-decay. It has zero rest mass, no charge and half spin. It has an antiparticle called antineutrino. It can have any energy from zero to any value permitted by the nuclear reaction. Its nature is non-electromagnetic.

Importance of conceptual questions for class 12 physics

Conceptual questions are of utmost importance in Class 12 Physics for several reasons. These questions focus on understanding the fundamental principles and concepts rather than just rote memorization of equations and formulas. Here are some reasons why conceptual questions are crucial in Class 12 Physics:

Deep understanding: Conceptual questions require students to grasp the underlying principles and theories behind physical phenomena. This leads to a deeper understanding of the subject, making it easier to apply the knowledge to various problem-solving scenarios.
Critical thinking: When students tackle conceptual questions, they are encouraged to think critically and analytically. These questions often involve complex scenarios that demand logical reasoning and creative thinking to arrive at the right answers.
Problem-solving skills: Conceptual questions challenge students to solve unfamiliar and intricate problems. As a result, their problem-solving skills are honed, preparing them to tackle more advanced scientific challenges in the future.
Application of concepts: By answering conceptual questions, students learn to apply theoretical concepts to practical situations. This bridges the gap between theory and real-world applications, fostering a holistic understanding of Physics.
Better exam preparation: Class 12 board exams and competitive entrance exams often include conceptual questions. Preparing for such questions not only improves performance in exams but also sets a strong foundation for further studies in physics-related fields.
Enhanced retention: Understanding concepts leads to better retention of knowledge. Unlike rote memorization, conceptual understanding stays with students for a long time, making it easier to build on that knowledge in the future.
Encouraging curiosity: Conceptual questions often pique students’ curiosity and encourage them to explore the subject further. This can spark an interest in Physics as a whole, leading to a lifelong passion for the subject.
Formulating connections: Conceptual questions help students make connections between different topics and subfields within Physics. This interconnected knowledge is essential for a comprehensive understanding of the subject.
Learning from mistakes: When students attempt conceptual questions, they may make mistakes. However, these mistakes provide valuable learning opportunities, as they highlight areas that need further clarification and understanding.
Building confidence: Successfully answering conceptual questions gives students a sense of accomplishment and boosts their confidence in their Physics abilities.

Conceptual Questions for Class 12 Physics Chapter 13 Nuclei

Conceptual Questions for Class 12 Physics Chapter 13 Nuclei

Importance of conceptual questions for class 12 physics

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