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Quoth · 08-13-2023, 05:21 AM

There are real threats, such as: bad drivers, vaping (affects lungs of people close by), coal fired power stations, poorly tested software, hate & bullying posts on Social Media, sun bathing without sunblock, poorly regulated guns, lack of affordable health care.

The issue in schools isn't WiFi or Mobile signals. It's distraction of mobile phones.

There is a section here for rants: https://www.mobileread.com/forums/sh...ewpost&t=23762

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An experiment regarding cumulative and absolute power.

You can hold a lit 1W incandescent (filament) bulb as long as you like. A 100W halogen or simple filament bulb can't be held. A 500W halogen tube lamp will burn you if you try to touch it.

A WiFi gadget is typically 0.25W and if reading the screen, the effective power on your face is about 0.000625W because it's about 20cm away and the signal spreads out (inverse square law).

A microwave oven is about 800W average. So no matter if it used light, IR , shortwave radio or microwave, that power will heat what is inside it. But it uses a magnetron, so actually does short pulses of about 10,000 W that average to 800W. The power setting simply cycles it on and off over a longer period. So the oven has a metal grill on the window to keep the radio pulses in.

A 1W lamp bulb is totally harmless and at a few inches (4cm) away zero cumulative effect. A 300W lamp bulb 4″ (10cm) from your face will burn it.
Up close to a 500W carbon arc lamp, close enough to feel the heat, will at least give you sunburn. Prolonged exposure might give cataracts, or blindness or skin cancer, like staring at the sun at noon in the summer, because the power is over the threshold for damage even in the short term.

I've seen high power RF (200W) light up an unconnected fluorescent tube. That's possibly an unsafe amount of RF.

08-13-2023, 05:21 AM	#19
Quoth Still reading Posts: 14,340 Karma: 105899727 Join Date: Jun 2017 Location: Ireland Device: All 4 Kinds: epub eink, Kindle, android eink, NxtPaper	There are real threats, such as: bad drivers, vaping (affects lungs of people close by), coal fired power stations, poorly tested software, hate & bullying posts on Social Media, sun bathing without sunblock, poorly regulated guns, lack of affordable health care. The issue in schools isn't WiFi or Mobile signals. It's distraction of mobile phones. There is a section here for rants: https://www.mobileread.com/forums/sh...ewpost&t=23762 Edit An experiment regarding cumulative and absolute power. You can hold a lit 1W incandescent (filament) bulb as long as you like. A 100W halogen or simple filament bulb can't be held. A 500W halogen tube lamp will burn you if you try to touch it. A WiFi gadget is typically 0.25W and if reading the screen, the effective power on your face is about 0.000625W because it's about 20cm away and the signal spreads out (inverse square law). A microwave oven is about 800W average. So no matter if it used light, IR , shortwave radio or microwave, that power will heat what is inside it. But it uses a magnetron, so actually does short pulses of about 10,000 W that average to 800W. The power setting simply cycles it on and off over a longer period. So the oven has a metal grill on the window to keep the radio pulses in. A 1W lamp bulb is totally harmless and at a few inches (4cm) away zero cumulative effect. A 300W lamp bulb 4″ (10cm) from your face will burn it. Up close to a 500W carbon arc lamp, close enough to feel the heat, will at least give you sunburn. Prolonged exposure might give cataracts, or blindness or skin cancer, like staring at the sun at noon in the summer, because the power is over the threshold for damage even in the short term. I've seen high power RF (200W) light up an unconnected fluorescent tube. That's possibly an unsafe amount of RF. Last edited by Quoth; 08-13-2023 at 05:58 AM.