The EM spectrum is generally divided into seven regions, in order of decreasing wavelength and increasing energy and frequency. The common designations are: radio waves, microwaves, infrared (IR), visible light, ultraviolet (UV), X-rays and gamma rays.

The propagation of electromagnetic waves either in a certain medium or in vacuum is due the the mutual changes between the electric and magnetic field. These variations in electric and magnetic fields fields lead to the transfer of the energy which is carried by the EM wave.

Violet has the shortest wavelength, at around 380 nanometers, and red has the longest wavelength, at around 700 nanometers.

Radio waves

Red

So the shortest wavelength is 1215.4Ao. So this is the required shortest and the longest wavelength of the Balmer series of hydrogen (H2) spectrum.

Violet waves

Re: How to find the longest wavelength? The longest wavelength, as everyone mentioned, comes from the work function. Using the value of energy from the work function, solve for wavelength using E = h(c)/(wavelength).

What are the two longest wavelength lines (in manometers) in the Lyman series of hydrogen spectrum ? The Wavelength (λ) will be longest when n2 is the smallest i.e., n2=2 and 3 for two longest wavelength lines. Step by step solution by experts to help you in doubt clearance & scoring excellent marks in exams.

So, the longest wavelength is 1.22×10−5cm. Therefore, the shortest and longest wavelengths in hydrogen spectrum of Lyman series are 9.11×10−6cmand 1.22×10−5cm respectively.

• 4 : 1. B.
• 4 : 9. C.
• 4 : 3. D.
• 5 : 9. Medium. Answer. Correct option is. A.
• 4 : 1. For transition n2​→n1​ the wavelength is given by λ1​=RZ2(n12​1​−n22​1​) For shortest wavelength in Lyman series put n1​=1 and n2​→∞ and for shortest wavelength in Balmer series put n1​=2 and n2​→∞ we get λL​1​=RZ2. and λB​1​=RZ2(41​)

The shortest wavelength of the Brackett series of a hydrogen-like atom (atomic number Z) is the same as the shortest wavelength of the Balmer series of hydrogen atoms.

Therefore, 8.21×10−7m is the shortest wavelength in the Paschen series of spectral lines.

The shortest wavelength of H-atom in Lyman series is x, then longest wavelength in Balmer series of He+ is. ∴λHλHe=4R3R=43. Step by step solution by experts to help you in doubt clearance & scoring excellent marks in exams.

91.2nm

Lines are named sequentially starting from the longest wavelength/lowest frequency of the series, using Greek letters within each series. For example, the (n1=1/n2=2) line is called “Lyman-alpha” (Ly-α), while the (n1=3/n2=7) line is called “Paschen-delta” (Pa-δ).

Order is as follows (shortest to longest wavelength): Gamma, X-Rays, UV, Visible, Infrared, Microwaves, Radio Waves. Gamma has the shortest wavelength because it has a higher frequency, meaning more waves in a second than any other radiation, which results in the short wavelength.

The reason that the human eye can see the spectrum is because those specific wavelengths stimulate the retina in the human eye. If we move beyond the visible light region toward longer wavelengths, we enter the infrared region; if we move toward shorter wavelengths, we enter the ultraviolet region.

In order from highest to lowest energy, the sections of the EM spectrum are named: gamma rays, X-rays, ultraviolet radiation, visible light, infrared radiation, and radio waves. Microwaves (like the ones used in microwave ovens) are a subsection of the radio wave segment of the EM spectrum.

The most important of these is visible light, which enables us to see. Radio waves have the longest wavelengths of all the electromagnetic waves.

We call the energy we can see visible light (we discuss it in detail in our main article on light) and, like radio waves, microwaves, and all the rest, it’s made up of electromagnetic waves.

The electromagnetic spectrum includes, from longest wavelength to shortest: radio waves, microwaves, infrared, optical, ultraviolet, X-rays, and gamma-rays. To tour the electromagnetic spectrum, follow the links below!

Behaviour and uses of electromagnetic waves

• Radio waves. Radio waves are used for communication such as television and radio.
• Microwaves. Microwaves are used for cooking food and for satellite communications.
• Infrared.
• Visible light.
• Ultraviolet radiation.

Sources of Electromagnetic Radiation

• solar radiation, in other words natural radiation that originates from the sun.
• terrestrial radiation, in other words natural radiation emitted by the Earth’s surface.
• artificial radiation originating from a remote sensing system.

Electromagnetic waves are ubiquitous in nature (i.e., light) and used in modern technology—AM and FM radio, cordless and cellular phones, garage door openers, wireless networks, radar, microwave ovens, etc. These and many more such devices use electromagnetic waves to transmit data and signals.

Everyday life is pervaded by artificially made electromagnetic radiation: food is heated in microwave ovens, airplanes are guided by radar waves, television sets receive electromagnetic waves transmitted by broadcasting stations, and infrared waves from heaters provide warmth.