[xstrae]

This problem i came across stumps me. can someone please guide me?

A series of lines in the spectrum of atomic hydrogen lies at wavelengths 656.46 , 482.7, 434.17, 410.29 nm. What is the wavelength of the next line in the series??
where do i begin??

thanks in advance

[Albert]

Check these out:

http://hyperphysics.phy-astr.gsu.edu/hbase/hyde.html

http://teacher.pas.rochester.edu/phy_labs/Hydrogen/Hydrogen_spectrum.html

The former, in particular, could be rather useful, in my opinion.

[xstrae]

Calculate the de broglie wavelength of an electron that has been acceleraed from rest through a potential differnece of 1kV.

 

[xstrae]

yup thanks a lot. the first was helpful.
all the wavelengths given above correspnd to the visible region of the electromagnetic spectrum. Therefore they belong to the Balmer series. so substituting in the formula, we get 396nm as the next in line. thanks!

[Donaldson Tan]

Calculate the de broglie wavelength of an electron that has been acceleraed from rest through a potential differnece of 1kV.

The kinetic energy of the electron is there 1000 electron-volt (E = Q*V)

Since the electron mass is known, what is the momentum that corresponds to 1000 electron-volt kinetic energy?

you should be able to calculate the wavelength from the momentum using debroglie's equation.

[xstrae]

thanks a lot!