242×1018 ∴ 6.242 × 1018 electrons takes → = 6.242 × 109 sec 3×107 1 Year = sec 1 Second = Yr. 3×107 6.242×109 6.242×109 Sec. = Yr. 3×107 = 2.086×102 = 208 yr. ≈ 200 yr. According to the option, the correct answer is ≈ 200 year. 7. Magnetism 86. Remote Sensing u ses which of the following in its applications ?

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Accepted Answer

(d) Electromagnetic Waves — Remote Sensing uses Electromagnetic Waves in its applications. For most purposes, the ultraviolet or UV portion of the spectrum has the shortest wavelengths, which are practical for remote sensing. The light, which our eyes can detect, is part of the visible spectrum. The visible wavelengths cover a range from approximately 0.4 to 0.7 µm. The longest visible wavelength is red and the shortest is violet.

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(A) Electric Waves

Answer

(B) Sonar Waves

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(C) Gamma Rays

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