Cosmic Background Radiation

Physics ⇒ Earth and Space Physics

Cosmic Background Radiation starts at 11 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Cosmic Background Radiation. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.

See sample questions for grade 11

Calculate the energy of a CMB photon with a wavelength of 1 mm. (Use Planck's constant h = 6.63 × 10^-34 J·s and c = 3 × 10⁸ m/s.)

Calculate the frequency corresponding to the peak wavelength of the CMB (1 mm). Use the speed of light c = 3 × 10⁸ m/s.

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.

Explain why the CMB is now observed in the microwave region rather than visible light.

Explain why the cosmic microwave background radiation is considered a 'snapshot' of the early universe.

The CMB has a blackbody spectrum. What does this indicate about its origin?

The cosmic microwave background radiation is nearly uniform in all directions. What does this suggest about the early universe?

What does the term 'anisotropy' mean in the context of the CMB?

What is cosmic background radiation?

What is the significance of the dipole anisotropy observed in the CMB?

A region of the CMB is observed to have a temperature of 2.7255 K, while the average CMB temperature is 2.725 K. Calculate the temperature fluctuation (ΔT/T) in this region. Express your answer in scientific notation.

Describe the Sachs-Wolfe effect and its significance in the study of the cosmic microwave background radiation.

Explain how the polarization patterns observed in the cosmic microwave background radiation provide evidence for gravitational waves in the early universe.