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A student makes the following statements about the expanding Universe: I The evidence supporting the existence of dark matter comes from estimations of the mass of galaxies - Scottish Highers Physics - Question 8 - 2022
Question 8
A student makes the following statements about the expanding Universe: I The evidence supporting the existence of dark matter comes from estimations of the mass of ... show full transcript
Worked Solution & Example Answer:A student makes the following statements about the expanding Universe: I The evidence supporting the existence of dark matter comes from estimations of the mass of galaxies - Scottish Highers Physics - Question 8 - 2022
Step 1
I The evidence supporting the existence of dark matter comes from estimations of the mass of galaxies.
Answer
This statement is correct. Dark matter's existence is inferred from gravitational effects on visible matter, especially galaxy movements and the mass calculations from their gravitational influence.
Step 2
II The evidence supporting the existence of dark energy comes from the accelerating rate of expansion of the Universe.
Answer
This statement is also correct. Observations show that the rate of expansion of the Universe is increasing, which suggests the presence of dark energy driving this acceleration.
Step 3
III The peak wavelength of radiation emitted by hotter stars is longer than that for cooler stars.
Answer
This statement is incorrect. According to Wien's displacement law, hotter stars emit radiation at shorter peak wavelengths than cooler stars. Therefore, as the temperature of a star increases, the peak wavelength decreases.
Step 4