Question

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

• A. $10^{2}$
• B. $104$
• C. $10^{6}$
• D. $10^{8}$

Answer 1

Answer: (C)

$10^{6}$

Answer 2

: Frequency of microwaves,$\upsilon_{m} \approx 10^{11}Hz$

Frequency of ultrasonic sound waves, , $\upsilon_{u} \approx 10^{5}Hz$

$\therefore\frac{\upsilon_{m}}{\upsilon_{m}} = \frac{10^{11}}{10^{5}} = 10^{6}$