Strategies for solving questions related to atomic and nuclear physics in the JEE Main exam:

1. Understand the concepts:
It is crucial to have a clear understanding of the fundamental concepts of atomic and nuclear physics. This includes topics such as atomic structure, Bohr's model, quantum numbers, nuclear reactions, radioactive decay, and nuclear fission and fusion. Reviewing the relevant theories and formulas will help in solving the questions effectively.

2. Practice numerical problems:
Atomic and nuclear physics questions often involve numerical calculations. Practice solving a variety of numerical problems to get familiar with the different types of calculations that may be asked in the exam. Pay attention to units and conversions, as they play a significant role in obtaining the correct answers.

3. Analyze the given information:
Carefully read and analyze the information provided in the question. Identify the key components such as the elements involved, energy levels, decay processes, or any other relevant details. This will help in formulating the appropriate approach to solve the problem.

4. Apply conservation laws:
Conservation laws, such as conservation of energy, momentum, and charge, are often applicable in atomic and nuclear physics problems. Identify which conservation law(s) are relevant to the given question and apply them accordingly. These laws can provide useful equations or constraints to solve the problem.

5. Use the correct formulas:
Select the appropriate formulas based on the given information and the desired outcome. Memorize and understand the formulas related to atomic structure, energy levels, radioactive decay, and nuclear reactions. Using the correct formulas and equations will lead to the correct solution.

6. Solve step-by-step:
Break down the problem into smaller steps and solve them one by one. This will prevent confusion and ensure a systematic approach towards finding the solution. Clearly write down the given data, the variables to be determined, and the intermediate steps involved in the solution. This will help in organizing the calculations and avoiding mistakes.

7. Check for consistency and accuracy:
After obtaining the final answer, always double-check its consistency and accuracy. Ensure that the units are correct, the calculations are accurate, and the answer makes sense in the context of the question. If time permits, it is advisable to recheck the entire solution to minimize errors.

By following these strategies, you can effectively approach and solve questions related to atomic and nuclear physics in the JEE Main exam. Regular practice and a thorough understanding of the concepts will also boost your confidence in tackling such questions.