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Given below are some fomous numbers associated with electromagnetic radiation in different contexts in physics .State the part of the electromagnetic spectrum to which each belongs . 21 cm (wavelength emitted by atomic hydrogen in interstellar space ).
Given below are some fomous numbers associated with electromagnetic radiation in different contexts in physics .State the part of the electromagnetic spectrum to which each belongs . 21 cm (wavelength emitted by atomic hydrogen in interstellar space ).
Physics | Previous Year Question Papers
Given below are some fomous numbers associated with electromagnetic radiation in different contexts in physics .State the part of the electromagnetic spectrum to which each belongs . 21 cm (wavelength emitted by atomic hydrogen in interstellar space ).

Radiation of wavelength of 21 cm : It corresponding to radio waves of short wavelength.

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At a certain location in Africa, a compass points $12^{\circ}$ west of the geographic north. The north tip of the magnetic needle of a dip circle placed in the plane of magnetic meridian points above the horizontal. The horizontal component of the earth’s field is measured to be $0.16 \mathrm{G} .$ Specify the direction and magnitude of the earth’s field at the location.At a certain location in Africa, a compass points $12^{\circ}$ west of the geographic north. The north tip of the magnetic needle of a dip circle placed in the plane of magnetic meridian points above the horizontal. The horizontal component of the earth’s field is measured to be $0.16 \mathrm{G} .$ Specify the direction and magnitude of the earth’s field at the location.