Determining the wavelengths Hα, Hβ and Hγ from the Balmer series of hydrogen

VP6.2.1.1
Determining the wavelengths Hα, Hβ and Hγ from the Balmer series of hydrogen
Determining the wavelengths Hα, Hβ and Hγ from the Balmer series of hydrogen Emission spectrum of atomic hydrogen (P6.2.1.1)
Determining the wavelengths Hα, Hβ and Hγ from the Balmer series of hydrogen

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Description

In the experiment P6.2.1.1, the emission spectrum is excited using a Balmer lamp filled with water vapor, in which an electric discharge splits the water molecules into an excited hydrogen atom and a hydroxyl group. The wavelengths of the lines Hα, Hβ and Hγ are determined using a high-resolution grating. In the first diffraction order of the grating, we can find the following relationship between the wavelength λ and the angle of observation ϑ:

The measured values are compared with the values calculated according to the Balmer formula.

Components of equipment sets

1 45113  8  Balmer lamp LD
1 451141 Power supply unit for Balmer lamp LD
1 47123  4  Ruled grating, 6000/cm (Rowland) LD
1 31178  4  Tape measure 2 m / 1 mm LD
1 46002  8  Lens in frame, f=50 mm LD
1 46003  8  Lens in frame, f=100 mm LD
1 46014  8  Adjustable slit LD
1 46022  8  Holder with spring clips LD
1 44153  8  Screen, translucent LD
1 460310  8  Optical bench, S1 profile, 1 m LD
6 4603112  8  Clamp rider with clamp 75/65 LD
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