1.
Simply
multiply! 150 million x 20 = 3000 million or 3,000,000,000
miles away.2. A trillion is expressed
as 10^{12}, and 100 is 10^{2}.
So
100 trillion is 10^{14}. 3. Set up this proportion: Earth
Actual
= Earth ScaleJupiter Actual Jupiter Scale 12,800 km
=
4 cm143,000 km xx = 44.7 cm (a beach ball) 4. The method here is similar to #3 - use a proportion! SS Actual =
SS ScaleMW Actual MW Scale 1 ly
= 1 cm100,000 ly xx = 100,000 cm = 1000 meters (a domed stadium) |

1. a.
Continuous Spectrum - a rainbow of all the colors with no gaps.
b. Emission spectrum - bright lines separated by blackness c. Absorption spectrum - a continuous spectrum with black lines superimposed on top. 2. Every time an electron jumps to a higher energy level it absorbs energy. When it falls back down, it emits a specific wavelength of energy (a photon). This is seen as a line in an emission spectrum. 3. The conversion between Celsius and Kelvin is K = C + 273. So –25 °C
is 248 °K.4. Wien's Law tells us that the wavelength is 2,900,000/ 248° = 11,694 nm or 11.7 micrometers, which is in the infrared. 5. Again you use Wien's Law: T = 2,900,000/wavelength =
2,900,000
/ 425 = 6824 °K. This star is a little brighter and hotter than the Sun. 6. A blue shift means it is moving toward us, and the red shift means movement away from us. This indicates a rotation of this galaxy, counterclockwise from our perspective. Return
to the
Practice
Questions section. |