By Adrian C. Melissinos

A revision of the best textual content on experimental physics. The function of this publication that has made it the most enjoyed texts at the topic is that it is going a ways past an insignificant description of key experiments in physics. the writer effectively presents the reader with an knowing and appreciation of the 'physics' in the back of the experiments. the second one version could be an in depth revision introducing many new units, together with using desktops and software program courses, that experience come into use because the book of the 1st version. furthermore the $64000 components of condensed topic physics and optical physics should be further, together with totally new chapters on lasers and optics.

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4 Data on the Fine Structure of Sodium as Obtained with a Grating Spectrometer , ,, , ! " , Line . , -- , Order ,. "'iII x 10-4 41 °29' 41°27 3 US fh• 'I 2 Green ii' • ill , Ii 81 2 3 Red , ~ ,• ," ... ,. ....... , · ,, · , , , , , .. ,· , , ' .. , , , , ,, , , ,, , , ,, , , ,, , ,, , , •,• ,, , , , ,, , ,, , ·. , , , , 'A .... ....... ,... , - A ..... , ...... • ,, ,,' II· ·,. , . , . , ,·, . , ,. · ,. , ,. , , •, . , • , , , , , , , , , , , , .. .. 6 The Spectra of Sodium and Mercury 39 To reduce the data we note that where OJ is the angle of incidence.

12) For the hydrogen atom where Z = 1, the expression in brackets in Eq. 6 e V. This is the energy required to take an electron in the ground state (n = 1) and separate it from the nucleus completely (E = 0). We refer to it as the binding energy of the hydrogen atom. 13) where Roo = 1 109737314534 m- ~ ··:. ·. ·. ':. • · · ,. · • · · •.. ':::,. 6057 eV. , • ,•• ,•• ,•• ,•• ,•• ,•• ,•• ,• ,•• ,•• ,•• ,•• , •A ,• , , ~. , ~. ,•~. , ~. ,• , ,, , , , ," , Fwthennore, from Eq. ol~ol • ,• , ,, , ,• , ,, , ,, ·· · •,.

In this laboratory a small constant-deviation prism spectrograph and a . ng spectrometer were used. We will consider in detail a lm""",ement of the hydrogen spectrum with the grating, since an absolute for the wavelengths can be obtained and visual detection is used. 4. From Fig. 14, it is evident that the path difference between rays 1 and +dter reftocti,," IS BD - AC = CB sin Or - CB sinBi . C B is the grating spacing d. ~w;;h~:e~:n::th~ey lie on opposi te sides oflhe normal. Since for collstruc· ··t the path difference must be a multiple of the wavelength, : we obtain the condition n).

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