If the frequencies of an ultrasonic wave and an electromagnetic wave are same, then:

their wavelength will be same

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wavelength of electromagnetic wave will be less than that of ultrasonic wave

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wavelength of electromagnetic wave will be more than that of ultrasonic wave

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the wavelengths of both will be nearly equal

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Solution

The correct option is D wavelength of electromagnetic wave will be more than that of ultrasonic wave
Speed of a wave= $v = λ ν$
Thus $v \propto λ$
Since the speed of electromagnetic wave or the speed of light is more than the speed of ultrasonic wave(sound), the wavelength of electromagnetic wave is more than that of ultrasonic wave.

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