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Source of EM Waves

The frequency...

Question

The frequency of radiations arising from two close energy levels in hydrogen, known as lamb shift is $1057 M H z$ . This frequency falls in which range of electromagnetic waves?

A

Infrared rays

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B

X-rays

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C

y-rays

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D

Radio waves

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Solution

The correct option is D Radio waves
This given frequency corresponds to the radio waves i.e short wavelength or high frequency.

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Q. Given below are some famous numbers associated with electromagnetic radiations in different contexts in physics. State the part of the electromagnetic spectrum to which each belongs. (a) 21 cm (wavelength emitted by atomic hydrogen in interstellar space). (b) 1057 MHz (frequency of radiation arising from two close energy levels in hydrogen; known as Lamb shift). (c) 2.7 K [temperature associated with the isotropic radiation filling all space-thought to be a relic of the ‘big-bang’ origin of the universe]. (d) 5890 Å - 5896 Å [double lines of sodium] (e) 14.4 keV [energy of a particular transition in 57Fe nucleus associated with a famous high resolution spectroscopic method (Mössbauer spectroscopy)].

Q. Arrange the following electromagnetic waves in increasing order of their frequencies (i.e., begin with the lowest frequency): Visible light,

γ

rays, X rays, micro waves, radio waves, infrared radiations and ultraviolet radiations.

Given below are some famous numbers associated with electromagnetic radiations in different contexts in physics. State the part of the electromagnetic spectrum to which each belongs.

(a) 21 cm (wavelength emitted by atomic hydrogen in interstellar space).

(b) 1057 MHz (frequency of radiation arising from two close energy levels in hydrogen; known as Lamb shift).

(c) 2.7 K [temperature associated with the isotropic radiation filling all space thought to be a relic of the big-bang origin of the universe].

5890 ˚ A - 5896 ˚ A

[double lines of sodium]

(e) 14.4 ke V [energy of a particular transition in

^{57}

Fe nucleus associated with a famous high resolution spectroscopic method (

M ¨ o ssbauer spectroscopy

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Source of EM Waves

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