How many frequencies are listed for diathermy in the material?

How many frequencies are listed for diathermy in the material?

• A. Three
• B. Two
• C. Four
• D. One

Answer: (A)

Diathermy heating relies on delivering energy at specific radiofrequencies, and the material lists three standard frequencies used for shortwave diathermy. These three frequencies—13.56 MHz, 27.12 MHz, and 40.68 MHz—are the common ISM-band settings historically utilized in therapeutic diathermy, each affecting tissue heating in slightly different ways. The presence of three distinct frequencies in the material reflects this range of standard options rather than just a single setting. (Note that microwave diathermy uses different frequencies, but the question focuses on the listed shortwave frequencies.)

Diathermy heating relies on delivering energy at specific radiofrequencies, and the material lists three standard frequencies used for shortwave diathermy. These three frequencies—13.56 MHz, 27.12 MHz, and 40.68 MHz—are the common ISM-band settings historically utilized in therapeutic diathermy, each affecting tissue heating in slightly different ways. The presence of three distinct frequencies in the material reflects this range of standard options rather than just a single setting. (Note that microwave diathermy uses different frequencies, but the question focuses on the listed shortwave frequencies.)