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During the twentieth century red-shift and CMB radiation were discovered - Edexcel - GCSE Physics - Question 1 - 2013 - Paper 1
Question 1
During the twentieth century red-shift and CMB radiation were discovered. They have provided scientists with data to test theories of the origin of the Universe. (... show full transcript
Worked Solution & Example Answer:During the twentieth century red-shift and CMB radiation were discovered - Edexcel - GCSE Physics - Question 1 - 2013 - Paper 1
Step 1
Step 2
State which theory about the origin of the Universe is supported by the existence of CMB.
Answer
The existence of the CMB supports the Big Bang theory. This theory posits that the universe began from an extremely hot and dense state, and as it expanded, it cooled, leading to the formation of cosmic microwave background radiation.
Step 3
State what is meant by red-shift.
Answer
Red-shift refers to the phenomenon where light from distant galaxies is shifted towards the red end of the spectrum due to the galaxies moving away from us. This change indicates that the universe is expanding, as the observed wavelength of the light is longer than it would be if the source were stationary.
Step 4
Step 5
Explain what additional data can be collected and processed using modern telescopes.
Answer
Modern telescopes can detect different wavelengths of electromagnetic radiation, such as infrared and ultraviolet, which were not as effectively captured by older telescopes. They are equipped with advanced sensors and imaging technologies, allowing for clearer and more detailed observations. Additionally, data analysis techniques, facilitated by computers, enable more sophisticated processing of the signals received, aiding in the detection of faint celestial objects and phenomena.