Cosmic Background Radiation
Physics ⇒ Earth and Space Physics
Cosmic Background Radiation starts at 11 and continues till grade 12.
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Describe how measurements of the CMB can be used to estimate the age of the universe.
Describe the impact of foreground sources, such as our galaxy, on CMB observations.
Describe the process of recombination in the context of the CMB.
Describe the relationship between the expansion of the universe and the cooling of the CMB.
Describe the significance of the small fluctuations observed in the CMB.
Explain how the CMB supports the theory of the expanding universe.
Explain the role of the CMB in testing the theory of cosmic inflation.
Explain why the CMB is important for understanding the composition of the universe.
The CMB is a remnant from which era of the universe? (1) Inflationary era, (2) Recombination era, (3) Nucleosynthesis era, (4) Dark energy era
The CMB was first detected as excess noise in which type of instrument? (1) Optical telescope, (2) Radio antenna, (3) X-ray detector, (4) Particle accelerator
The cosmic microwave background (CMB) is most accurately described as: (1) Ultraviolet radiation, (2) Infrared radiation, (3) Microwave radiation, (4) Gamma radiation
What is the peak wavelength of the CMB radiation? (1) 1 mm, (2) 0.1 mm, (3) 2 mm, (4) 10 mm
Fill in the blank: The CMB is a nearly perfect ______ spectrum.
Fill in the blank: The CMB is observed today at a temperature of about ______ K, but at the time of recombination, it was about 3000 K.
Fill in the blank: The CMB provides a direct measurement of the universe's ______ at the time of recombination.
Fill in the blank: The CMB was emitted when the universe was about ______ years old.
True or False: The CMB can be detected with radio telescopes on Earth.
True or False: The CMB is completely uniform with no variations.
True or False: The CMB is evidence that the universe was once much hotter and denser than it is today.
True or False: The CMB is only detectable from space and not from the ground.
