How Can You Measure Light Intensity Variation with Wavelength Using an LDR?

In summary, the conversation discusses designing a lab experiment using a LDR to investigate the relationship between light intensity and wavelength. The homework equations involve determining the wavelength of light falling on the LDR, obtaining a measure of intensity, and controlling factors for a fair test. Safety precautions and accuracy measures are also mentioned. The suggestion of using a polaroid disc to measure wavelength is provided as a potential solution.
  • #1
question2007
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Homework Statement


Design a lab experiment using a LDR to investigate how the intensity of light emmited by a lamp varies with wavelength



Homework Equations



how the wavelength of the light falling in the LDR is determined
how a measure of the intensity can be obtained from the LDR
factors to be controlled to ensure it's a fair test, safety precautions and particular features to ensure accuracy and reliability

The Attempt at a Solution

 
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  • #2
Welcome to the forums! You must make some attempt at the problem yourself before we can help you. What ideas do you have about the experiment? For example how can you select different wavelengths from a lamp and what is it about the LDR that could be used to measure intensity?
 
  • #3
i could use a polaroid disc to measure the wavelength
 

FAQ: How Can You Measure Light Intensity Variation with Wavelength Using an LDR?

1. What are the main objectives of an AS Physics practical?

The main objectives of an AS Physics practical are to develop skills such as observation, measurement, data collection and analysis, and to apply theoretical concepts learned in class to real-world experiments. It also helps students to develop critical thinking skills and to understand the scientific method.

2. How do I plan and design an AS Physics practical experiment?

To plan and design an AS Physics practical experiment, it is important to first identify a research question or hypothesis. Then, select appropriate equipment, materials, and methods to test the hypothesis. It is also important to consider safety precautions and potential sources of error. It is recommended to consult with your teacher or refer to textbooks and online resources for guidance.

3. What are some common types of errors in AS Physics practicals and how can they be reduced?

Common types of errors in AS Physics practicals include random errors, systematic errors, and human errors. To reduce these errors, it is important to repeat the experiment multiple times and take accurate measurements. It is also important to calibrate equipment and use proper techniques. Additionally, recording data and observations accurately can help reduce human errors.

4. How do I analyze and interpret data from an AS Physics practical?

To analyze and interpret data from an AS Physics practical, it is important to organize the data in tables or graphs and look for patterns or trends. Statistical analysis, such as calculating mean, standard deviation, and uncertainties, can also be helpful. It is important to compare the results to the expected outcomes based on theoretical concepts and to discuss any discrepancies or sources of error.

5. What are the key components of a well-written AS Physics practical report?

A well-written AS Physics practical report should include a clear introduction stating the research question or hypothesis, a detailed description of the methods and materials used, a thorough analysis and interpretation of data, and a conclusion that summarizes the findings and addresses the research question or hypothesis. It should also include appropriate diagrams, tables, and graphs to support the results and a list of references if necessary.

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