Class 11 Chemistry
Structure of Atom
Black body radiation and Photoelectric effect
Particle nature of Electromagnetic radiations :There were two important phenomenon that couldn’t be explained by considering Light with wave character:
The phenomenon is:
- Black body radiation
- Photoelectric effect
Lets first study about the nature of these phenomenon:
- Black body radiation: Black body is defined as perfect emitter and absorber of light.
For example, whenever we heat an Iron ball like objects, on heating they become first Red, then Orange, then Yellow and at very high temperature they become White.
According to the electromagnetic theory, the energy is emitted or absorbed continuously. So, the radiations emitted may vary in intensity, but should have same colour. The change in color shows, that wavelength also changes .This indicates non continuous flow of energy. So, it couldn’t be explained by electromagnetic theory. This phenomenon shows, that if we keep on heating the light that it emits. It will show changes in wavelength. That means the wavelength keeps on decreasing but after White there is no further change.
- Photoelectric effect
It is the ejection of electrons from metal surface when light of suitable wavelength strikes the metal surface.
The apparatus set to demonstrate this effect is given below:
To check the current flow, the ammeter is introduced in the circuit. The following observations were noticed:
- Light of suitable frequency can only eject electrons. Every metal surface has a set value of frequency that can cause ejection and that corresponding frequency is called threshold frequency (vo).
- Number of electrons ejected is directly proportional to intensity of light.
- Kinetic energy of electron is directly proportional to frequency of light that strikes the surface.
- The graphs drawn below shows the above observations:
So, these two-phenomenon Black body and Photoelectric effect couldn’t explain, considering light as a wave. To explain these two phenomena a new concept and new theory was put forward. According to which, light was supposed to possess a particle like character.
Problem 1:
- Calculate (a) wave number and (b) frequency of yellow radiation having wave length of 5800 A?
Answer –
- Calculation of wave number: wave number = 1/wave length
- Calculation of frequency: frequency = velocity(C) /wave length
- The Vivid Bharti station of all India Radio, Delhi broadcasts at a frequency of 1368 KHz (kilohertz). Calculate the wave of the Electromagnetic radiation emitted by the transmitter. Which part of the Electromagnetic spectrum does it belongs to ?
Answer : wave length = speed of light / velocity
Class 11 Chemistry Structure of Atom NCERT Chapter 2 Free Notes for Best Revision
Revision of Class 11 Chemistry Structure of Atom is a crucial aspect of effective learning. Revision plays a vital role in the learning process and is especially important before exams. Here are some key points you can consider emphasizing in your content:
- Retention and Memory: Regularly reviewing and revisiting the material of Class 11 Chemistry Structure of Atom helps reinforce the concepts in students' minds. It strengthens memory pathways, making it easier to recall information during exams and beyond.
- Consolidation of Knowledge: When you revise notes, you are essentially consolidating your knowledge. This means connecting new information with what you already know, making the overall understanding more robust.
- Identifying Knowledge Gaps: Revision allows students to identify any gaps in their understanding or areas where they need further clarification. This gives you a chance to seek help or delve deeper into those topics. For detailed understanding, you can always refer to the videos of Structure of Atom Class 11 Chemistry NCERT Chapter 2 on LearnoHub.com
- Building Confidence: As you revise Structure of Atom Class 11 Chemistry and become more familiar with the content, your confidence in your abilities grows. Confidence is a crucial factor in exam performance as it reduces anxiety and allows you to approach exams with a positive mindset.
- Different Revision Techniques: Use a variety of revision techniques such as summarizing notes, creating flashcards, practicing past papers, discussing concepts with peers, and teaching others. Different techniques work for different students, and it's essential to find what suits you the best. You can also attend the LIVE Revision classes on LearnoHub.com or watch the LIVE Revision Race videos of LearnoHub on Structure of Atom Class 11 Chemistry NCERT Chapter 2.
- Spacing Effect: Spacing out revision sessions over time, rather than cramming all at once, has been shown to improve long-term retention. Create a revision schedule leading up to the exams to allow for spaced practice.
- Regular Revision over Cramming: Regular and consistent revision throughout the academic year is very important. Waiting until the last moment to cram everything can be overwhelming and less effective than spaced-out revision.
- Self-Assessment: Assess your understanding periodically through quizzes or self-tests. This helps you to gauge your progress and identify areas that need further attention. Refer Class 11 Structure of Atom Online Tests.
- Balanced Approach: Remind students to strike a balance between revision and other activities. Adequate rest, exercise, and relaxation are essential for optimal learning and performance.
- Seeking Help: If you face difficulties during the revision process, Refer the videos of Class 11 Chemistry Structure of Atom. Clearing doubts promptly is crucial for a better grasp of the subject matter. You can always ask your doubts on Structure of Atom Class 11 Chemistry NCERT Chapter 2. “Ask a Question” section of LearnoHub.com
By highlighting the benefits and strategies of effective revision, you can approach your studies more mindfully and achieve better results in your exams. Best of luck bachhon!
Class 11 Chemistry seems to be a quite difficult subject for a lot of students. But, if you get a very good conceptual understanding of the subject, it can be very interesting for you.
We, at LearnoHub, will give our best to make Class 11 Chemistry Structure of Atom NCERT Chapter 2 super-duper easy for you.
We aim at making learning fun as well as engaging for you with our complete end-end learning content with Structure of Atom Class 11 Chemistry Best videos, Notes, NCERT pdf, NCERT complete syllabus, tests and Practice Questions.
Always remember, it is very important to study with full concentration during Revision. Here are a few tips for you on how to revise with full focus:
- Create a Distraction-Free Environment: Find a quiet and comfortable place to study where you can minimize distractions. Turn off or silence your phone, log out of social media accounts, and inform others around you that you need uninterrupted study time. A dedicated study environment will help you focus better.
- Set Specific Goals: Before starting your study session, set clear and achievable goals. Break down your study material into smaller tasks, and plan what you want to accomplish during each session. Having specific goals will give you a sense of direction and purpose, making it easier to concentrate.
- Use the Pomodoro Technique: The Pomodoro Technique is a time management method that involves studying in short, focused intervals, typically 25 minutes, followed by a short break of 5 minutes. After completing four sessions, take a longer break of around 15-30 minutes. This technique can improve focus and productivity by providing regular breaks to recharge.
- Stay Organized: Keep your study materials, notes, and resources well-organized. Having everything you need at hand will save time and reduce distractions caused by searching for materials. Use color-coded folders or digital tools to maintain a structured study system.
- Practice Mindfulness and Meditation: Before you begin studying, take a few minutes to practice mindfulness or meditation. Deep breathing exercises and clearing your mind of distractions can help you approach your study session with a calm and focused mindset.
Remember, studying with full concentration is a skill that takes time and practice to develop. If you find your mind wandering during study sessions, gently bring your focus back to the task at hand and be patient with yourself. With consistent effort, you can improve your ability to concentrate and make the most of your study time.
Last but not the least, To get the best hold on Class 11 Chemistry Structure of Atom Book Chapter 2. Do not forget to check out:
- Structure of Atom Class 11 Chemistry Best videos
- Structure of Atom Class 11 Chemistry NCERT Solutions
- Class 11 Chemistry Structure of Atom Revision notes
- Structure of Atom Class 11 Chemistry DPPS, Download PDF of solutions
- Class 11 Chemistry Structure of Atom Online Tests
- Class 11 Chemistry Sample papers
