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  4. A microwave and an ultrasonic sound wave have the same wavelength. Their frequencies are in the ratio (approximately)

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Q. A microwave and an ultrasonic sound wave have the same wavelength. Their frequencies are in the ratio (approximately)

Electromagnetic Waves

Solution:

Frequency of microwaves, $\upsilon_{m} \approx 10^{11}\,Hz$
Frequency of ultrasonic sound waves, $\upsilon_{u} \approx 10^{5}\,Hz$
$\therefore \quad \frac{\upsilon_{m}}{\upsilon _{u}}= \frac{10^{11}}{10^{5}} = 10^{6}$