Expert Physics Tutoring

MS1:

- Red-shift is the observed increase in the wavelength of light from distant galaxies (1)

- Caused by expansion of the universe (1)

MS2:

- As galaxies move away, the wavelength of light they emit is stretched (1)

- Red-shift increases with distance from Earth (1)

- This supports the theory of an expanding universe (1)

MS3:

- Correct equation: v = cz (1)

- Substitute z = 0.5 and c = 3 × 10^8 m/s (1)

- Calculate v = 1.5 × 10^8 m/s (1)

MS4:

- The Hubble constant is a value that relates the distance to velocity of distant galaxies (1)

MS5:

- The Hubble constant provides a measurement of the rate of expansion (1)

- This supports the idea that the universe originated from a single point (1)

- The rate of expansion is decreasing, indicating a decelerating universe (1)

MS6:

- Correct equation: d = v/H (1)

- Substitute v = 210 km/s and H = 70 km/s/Mpc (1)

- Calculate d = 3 Mpc (1)

MS7:

- The CMB is faint radiation left over from the Big Bang (1)

MS8:

- The CMB is a uniform, isotropic blackbody radiation (1)

- Its temperature is consistent with the predicted temperature of the early universe (1)

- It provides support for the idea that the universe originated from a hot, dense state (1)

MS9:

- Correct equation: E = hc/λ (1)

- Substitute h = 6.63 × 10^-34 J s, c = 3 × 10^8 m/s, and λ = 1.1 × 10^-3 m (1)

- Calculate E = 1.13 × 10^-23 J (1)

MS10:

- The universe will continue to expand (1)

- Expansion may accelerate due to dark energy (1)

- The universe will eventually reach a "heat death" when all matter is dispersed and all stars burn out (1)