Question

mention one use of part of electromagnetic spectarn to which a wavelength of 21 cm emitted by hydrogen in interesteller space belong
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Answer 1

Answer:

(a)

Radio waves have wavelengths of 1mm to 100km. Hence, 21cm lies at short wavelength end of radio waves.

(b)

Radio waves belong to the shortest wavelength in the electromagnetic spectrum

Answer 2

Answer:

(a)

radio waves have wavelength of 1mm to 100km.Hence,21cm lies at short wavelength end of radio waves .

(b)

radio waves belong to the shortest wavelength in the electromagnetic spectrum.

(c)

ym =0.29/t=0.11cm

this wavelength corresponds to the Microwaves.

(d)

lines from 400nm to 700nm lines in visible range .the range of 589nm lines in yellow part of visible spectrum.

(e)

E=hv

v= 3.4 ×10'18 Hz

this corresponds to the X-rays