Basic Qualification · B-001 Regulations and policies · B-001-024-004
Why is the limit of exposure to RF the lowest in the frequency range of 48 MHz to 300 MHz, according to Safety Code 6?
- A Most transmissions in this range are for a longer time
- B The human body absorbs RF energy the most in this range
- C There are more transmitters operating in this range
- D There are fewer transmitters operating in this range
Correct answer: B — The human body absorbs RF energy the most in this range. From the official ISED question bank, verified word for word.
Why
Safety Code 6 sets the strictest exposure limits between 48 MHz and 300 MHz because the human body acts like a perfect antenna for these frequencies, absorbing radio frequency energy more efficiently than at any other range. The full explanation — and one for every question — is in Pro.
Practise this section
The rules: who may operate, what the certificate allows, station identification, third-party traffic, what you may and may not transmit, and how ISED regulates the amateur service.