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The ferequency 1057 MHz of radiation ari...

The ferequency `1057 MHz` of radiation arising from two close energy levels in hydrogen belong to:

A

radio waves

B

infrared waves

C

micro waves

D

`omega`-rays

Text Solution

Verified by Experts

The correct Answer is:
a
`v=1057 MHz`
`lambda=(c)/(v)=(3xx10^(8))/(1057xx10^(6))m`
`=0.28m=28cm`(radiowaves)
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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 hatA-5896hatA (double lines of sodium] (e) 14.4keV energy of a particular transition in .^(57)Fe nucleus associated with a famour high resolution spectroscopic method (mossbauer spectroscopy).

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A2Z-ELECTROMAGNETIC WAVES AND COMMUNICATION SYSTEM -Section D - Chapter End Test
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