The visible spectrum of hydrogen can be described accurately with an empirical formula found by the swiss teacher johann balmer in 1885. this formula, which gives the wavelength of a spectral line as a function of an integer quantity n , describes the spectrum known as the balmer series. by varying n , you can calculate the wavelength of all spectral lines.
part a
find the minimum value of n in the balmer series for which the predicted wavelength is in the ultraviolet region of the spectrum.

Answer: it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.explanation:   we have equation of motion ,where s is the displacement, a is the acceleration, u is the initial velocity and t is the time taken.average velocity = displacement/ time taken.average velocity = 10.69 miles/hr = 10.69*1.6*1000/(60*60) = 4.75 m/s4.75 = s/ts = 4. 1we also have acceleration = 2.18 m/s², initial velocity = 0 m/sso it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.

The boat's velocity relative to the riverbank can be resolved into two components. the component going north is 2.7 m/s and the component going west is 1.2 m/s.we add these two vectors and then find the magnitude of the resultant to get the speed.the magnitude of the resultant vector from adding can be obtained by the pythagorean theorem.    to two significant figures, the boat's speed relative to the riverbank is 3.0 m/s.

What type of question is that.

Ibelieve the answer to this is b.