When an electron is excited from n=2 to n=6, a photon of violet light is absorbed. If an electron on a Li^2+ ion is absorbed from n=4, which energy level must it rise to for violet of a similar wavelength is absorbed?

The solution to Fick's 2nd Law provided in the textbook (Eq. 5.11) for the process of carburization (see textbook Example 5.3 for a reminder). However, if one takes.Cs 0, then this expression can also be used for the reverse process of decarburization. I.e., carbon (initially at composition co) is removed from a component through its surface held at c, = 0. This is described by the similar %3D expression: erf ( 2 Dt This expression describes the concentration profile (the composition field) as the solute (carbon in this case) diffuses out of component (steel in this case) with an initial concentration of co. This situation can be accomplished by placing the steel in a vacuum at elevated temperature. If the initial composition of the carbon in the steel is co = 0.3 wt%, calculate the carbon concentration (in wt%) at a distance 0.2mm from the surface of the component after 1 hour of decarburization.

The planet Mars has an atmosphere of mostly COz (95%). (You can assume that Mars atmosphere is100% COz). The molecular weight of COz is 44. The temperature at "night" is cold at -140°C (i.e. minus 140° Celsius).. The temperature at "noon" during the day is +26°C. What is its velocity of sound "c"during the day and during the night (in m/s) on Mars?

2. The three types of radioactive emissions are called alpha (a), beta (B) and gamma (y) radiation. Complete the table below with the correct information about each type. Charge Atomic Symbol Can Be Stopped By Alpha Beta Gamma