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In Figure 2, the reference wavelength, \( \lambda_0 \), is shown at 390 nm - Edexcel - GCSE Physics - Question 4 - 2016 - Paper 1
Question 4
In Figure 2, the reference wavelength, \( \lambda_0 \), is shown at 390 nm. Estimate the change in the reference wavelength, \( \Delta \lambda \), for the light fro... show full transcript
Worked Solution & Example Answer:In Figure 2, the reference wavelength, \( \lambda_0 \), is shown at 390 nm - Edexcel - GCSE Physics - Question 4 - 2016 - Paper 1
Step 1
Estimate the change in the reference wavelength, \( \Delta \lambda \), for the light from galaxy D.
Answer
To estimate the change in the reference wavelength, we first note that the reference wavelength ( \lambda_0 ) is given as 390 nm. Assuming the light from galaxy D is redshifted due to its motion away from Earth, the change in wavelength can be calculated as follows:
Let’s denote the observed wavelength from galaxy D as ( \lambda ). The change in wavelength ( \Delta \lambda ) is given by:
Without specific values for ( \lambda ), we can denote ( \Delta \lambda ) in terms of arbitrary redshift parameters. If ( \lambda ) is a measurement from observations, subtract 390 nm from that value to find ( \Delta \lambda ).
Step 2
State two ways that the student can improve the observational techniques so that the quality of the image is improved.
Answer
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Use a longer exposure time: This allows more light from the galaxy to be captured by the camera, resulting in a clearer image.
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Stabilize the camera: Using a tripod or an alternative stabilizing method will reduce blurriness from camera movement during the exposure.