The picture below shows an asteroid and a comet.
Which of these statements best describes the difference between asteroids and
comets?
01) Asteroids were formed closer to the sun than comets.
O2) Comets were formed closer to the sun than asteroids.
O 3) Asteroids are formed of ice and comets are formed of gases.
O4) Comets are formed of ice and asteroids are formed of gases.

Alinearly polarized electromagnetic wave has an average intensity of 196 w/m^2. this wave is directed towards two ideal polarizers (in real polarizers, transmission is also effected by reflection and absorption). polarizer a is oriented with its transmission axis at an angle of θ_1=20.8∘ with the incident electric field. polarizer b has its axis at an angle of θ_2=63.0∘ with the incident electric field. what is the average intensity of the wave after it passes through polarizer a? what is the average intensity of the wave after it passes through polarizer b? suppose that the two polarizers a and b are interchanged. what would the average intensity be after passing through both polarizers?

Exercise 2. find the wavelength of a photon emitted when an electron jumps from the n = 3 energy level down to the n = 2 energy level. where is this photon in the electromagnetic spectrum?

How do you know how many valence electrons an atom has?