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(B) The electromagnetic spectrum is arranged in order of increasing frequency and decreasing wavelength. Starting from the longest wavelength to the s

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Radio waves

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(B) The electromagnetic spectrum is arranged in order of increasing frequency and decreasing wavelength. Starting from the longest wavelength to the shortest,the order is: $1$. Radio waves $2$. Microwaves $3$. Infrared rays $4$. Visible light $5$. Ultraviolet rays $6$. $X$-rays $7$. Gamma rays Since radio waves appear at the beginning of this sequence,they possess the longest wavelength among the given options.

List-$I$	List-$II$
$(a)$ Ultraviolet rays	$(i)$ Study crystal structure
$(b)$ Microwaves	$(ii)$ Greenhouse effect
$(c)$ Infrared waves	$(iii)$ Sterilizing surgical instruments
$(d)$ $X$-rays	$(iv)$ Radar system

The waves having maximum wavelength among the following electromagnetic waves is

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