4. (a) Which row of the table is correct for both force and velocity?
force rantial velocity
(b) Figure 6 shows a satellite orbiting the Earth - Edexcel - GCSE Physics - Question 4 - 2018 - Paper 1
Question 4
4. (a) Which row of the table is correct for both force and velocity?
force rantial velocity
(b) Figure 6 shows a satellite orbiting the Earth.
(i) State the name... show full transcript
Worked Solution & Example Answer:4. (a) Which row of the table is correct for both force and velocity?
force rantial velocity
(b) Figure 6 shows a satellite orbiting the Earth - Edexcel - GCSE Physics - Question 4 - 2018 - Paper 1
Step 1
Which row of the table is correct for both force and velocity?
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Answer
The correct answer is D: both force and velocity are vectors.
Step 2
State the name of the force that keeps the satellite in orbit around the Earth.
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Answer
The force that keeps the satellite in orbit around the Earth is called gravitational force or centripetal force.
Step 3
Draw an arrow on Figure 6 to show the direction of the force acting on the satellite, that keeps the satellite in orbit around the Earth.
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Answer
An arrow should be drawn from the satellite towards the center of the Earth, indicating the direction of the gravitational force.
Step 4
Describe what is meant by red-shift.
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Answer
Red-shift refers to the phenomenon where the wavelength of electromagnetic radiation from an object, such as a star or galaxy, increases, which corresponds to a decrease in frequency. This occurs when the object is moving away from the observer.
Step 5
Explain how red-shift provides evidence for the Big Bang theory.
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Answer
Red-shift supports the Big Bang theory by indicating that distant galaxies are moving away from us, suggesting that the universe is expanding. This correlation with the Doppler effect aligns with the Big Bang's prediction of an expanding universe.
Step 6
State what the 'M' in CMB radiation stands for.
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Answer
'M' in CMB radiation stands for 'microwave'.
Step 7
State what is meant by 'cosmic background radiation'.
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Answer
Cosmic background radiation refers to the faint afterglow of the Big Bang, detected as a uniform microwave radiation that fills the universe and is a key piece of evidence for the Big Bang theory.
Step 8
Explain how the presence of CMB radiation provides evidence for the Big Bang theory.
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Answer
The presence of CMB radiation serves as evidence for the Big Bang theory as it represents the relic radiation from the early universe, consistent with theory predictions. It provides a snapshot of what the universe looked like when it was only about 380,000 years old, reinforcing the idea of an expanding universe originating from a hot, dense state.
