Is static electricity harmful to humans?
Is static electricity harmful to humans?The duration of a static electricity event is measured in microseconds. As such, it can inflict very limited harm because harm usually requires exposure that can actually hold the heart in contraction, therefore not pumping blood. If you have a strong enough source, you can create static electricity strikes, for instance from a Van De Graaff generator, that repeats itself continuously as the electrodes build up static charge and release them into objects that are within striking distance, maybe YOU. Many people can absorb many strikes with little affect or pain. On the other hand, for others there is quite a bit of sharp pain and those people find the experience unpleasant. The experience is very similar to the static charge that can build up on a person who shuffles across a pile rug in the winter when the humidity is low, and touches a metal object such as a door knob. Do this and you will see a small spark. Some people do it for fun and enjoy the “shock” effect if you substitute another person for the door knob. Harmless pranks, for the most part, but not appreciated by some.
Which high frequency sounds can dogs hear? Does that frequency hurt dogs' ears? How?
Dogs are renowned for their superior sense of smell, but they’ve got pretty sharp ears too. Compared to a human, a dog’s hearing range is approximately twice as wide. Dogs typically can detect sounds between 67-45,000 Hz, while humans can detect sounds between 64-23,000. In the upper frequencies of a dog’s hearing range, the sounds can cause a dog irritation and discomfort.Canine Hearing RangeWhile dogs are capable of hearing higher frequencies than humans, they by no means have the widest hearing range. Bats and whales can hear sounds up to 110,000 Hz, but are less capable of detecting lower range sounds.Volume Plus Frequency Equals DiscomfortIt is not merely frequency that causes a sound to be uncomfortable for a dog. The sound must reach a certain volume too. At sufficient volumes, frequencies above 25,000 Hz become irritating for dogs. The louder and higher those sounds are, the more uncomfortable for the dog they become. Dogs may whimper, whine and run away if confronted with a sufficiently loud and high-frequency sound.Practical ApplicationsHumans use high-frequency sounds to deter dogs from approaching, to distract dogs from misbehaving and to call them. Personal dog deterrents rely on blasting a loud, high-frequency sound to confuse, startle and irritate a dog. These sounds cause no permanent hearing damage and once the dog is out of range, he will settle down. In some scenarios, it’s important for an owner to signal to a dog using a sound that is distinctive. Dog whistles are extremely high frequency, in some cases, they are higher than 23,000 Hz and are inaudible to human ears. These sounds cut through ambient noise and are more easily discernible for dogs.It’s not All BadSounds of a frequency between 23,000-25,000 Hz are inaudible to humans, but are tolerable for dogs. In some cases, the sounds are appealing to dogs because they are distinct from the familiar range of sounds present in the human environment. Pet food manufacturers have experimented with including sounds in this frequency range in their adverts to attract dogs to the television set.
Do sonic mosquito repellents work?
A2AWhile traveling through South Asia and Southeast Asia, I can tell you that I learned one thing about mosquitos - you can't beat them 100% unless you stay INSIDE a bug tent or some kind of big net with VERY small holes and NO openings. The most effective way to trick a mosquito is for it to think you're not there. They detect body heat and will go for the warmest available body. Luckily, I slept next to my boyfriend and he is MUCH warmer than me. They loved him.The first night we arrived in India, he had a DDT covered sheet that he completely wrapped himself in. Seriously, even his head was inside. They only thing visible was his hand sticking out the top, holding it closed. I thought that thing was a death trap and I had my fair share of bites the last time I was in China. I knew they were more or less unavoidable so I just got in my normal pajamas, got in bed and knocked out. Guess who got bit? Yep, right on his little hand. After that, he stopped using his blanket wrap. The only time we ever used another toxic repellent was when we slept in an open air house in the jungle in Sri Lanka and when we were on an island with sand fleas in the Maldives. We hopped in the bug tent and didn't come out til morning. The mosquitos, in both cases, we the least of our worries. Do I think the sonic thing is going to help you? No, I've never ever seen someone buy one. Coils are minimally effective while they're burning but they also choke you out - not my favorite. I've seen a scent emitting device similar to the sound device you showed. I don't think it worked either, but lots of people use those. My boyfriend bought one too. The effects were probably similar to that of a mosquito coil - possibly just makes people feel better. We finally bought a bug zapper for the inside of our house since the ducting in many apartments in China is connected. Even if we kept the doors and windows shut, they would come in through other people's apartments and fly right through to ours. If you can, keep the doors and windows shut at all times, buy an indoor bug zapper, and sleep next to someone warmer than you. Like Rich Pollack said, dont spend your money on gimmicks, especially when it prevents you from employing techniques that have at least SOME proven efficacy.Good luck!
Are electronic pest repellers harmful to human hearing?
They might irritate you, but for other reasons.If they worked even just a little bit, they would be adopted into every building code in the developed world. Meaning homes would have them built in when they are new. At the very least there would be outlets in the crawlspace and the attic to plug these devices into. So the irritation may come from spending money on snake oil that does not work.But hey, I am sure it is just a secret I don’t want you to know about. Never mind the countless independent studies that show they do not work. If they worked I would be servicing these systems and installing them because they would have results you can see, and a lot less work.
Will burning an incense stick set off a smoke detector?
It may or may not. It depends on proximity of the incense stick to the smoke detector, the size of the enclosed space both of them are in (if applicable), how much ventilation there is, and whether the smoke from the incense stick is flowing toward or away from the smoke detector. There are simply too many factors to consider, to be able to come up with a definite answer to this question.My guess is that if you hold a smoking incense stick directly below a properly-functioning smoke detector (so that visible, concentrated smoke is actually entering the air-sampling holes of the smoke detector), then it would probably sound the alarm.The best way to obtain the answer to this question is to try it out! You’ll get a much more reliable result if you just do the experiment yourself — and it’s very simple, quick, and cheap to do it.
Lump on my cat's back near it's tail...should i worry?
i discovered a lump the size of a ping pong ball on my cat's back near it's tail, He is 11 years old and otherwise very healthy and active. Eat's well and is perky... I thought it might have been a mosquito bite at the time (he only goes on the front gallery and does not come in contact with other animals.) I noticed last night that the lump is still there. Should i worry...
Why are some people more attractive to insects than other people? Some people can be bitten badly while others escape with hardly any bites at all. Why?
Good question! There have been a few studies performed on this phenomenon and more detailed answers might be forthcoming by Googling “Biting insect preferences for people (fleas) (mosquitoes) (bed bugs)”. It likely has to do with slight differences in the volatile compounds that evaporate from perspiration and dermal glandular secretions. Besides the attractiveness to biting insects of the carbon dioxide from exhaled breath, there may be other metabolic products in exhaled breath that biting insects consider to be host-seeking stimulants. As a side note, decades ago it was discovered that certain fragrances used in perfumes and other toiletry products proved to have similar chemistries to the pheromones of bees and wasps — including alarm pheromones, which incite nearby wasps to attack the persons wearing such products. For the most part, these compounds have since been replaced with insect-neutral fragrances.
Is "ultrasonic fly repeller " efficient to drive away flies from the kitchen?
It was said that Chinese were the first one who use the sound to repel pests thousands years ago. The ancient Chinese used the mechanically sensory-repellent device repel bugs and pest from their crops and building. And the device was operated manually at that time.Ultrasonic pest repeller is an electronic devices emitting high-frequency sounds that humans cannot hear. It is designed to repel, eliminate household pests, such as mice, bugs and other insects, which are normally found at homes.So, my answer is yes.But please install the device in the right place where there might be pests. Because the sound waves from ultrasonic pest controller is short range and not very strong, they may be blocked by furniture, walls and corners.PS: Landefensor is an professional pest control online store, which provide 15% discount compare with Amazon.
Would bug spray kill a tiny human?
Most insecticides are designed to attack insects in a way that does not affect humans. They have different nervous systems and they are targetable in different ways. That being said, there will likely be health effects although much different to what it does to ants. Here is the MSDS for raid ant and roach killer http://www.mcoe.us/view/1773.pdf From this you can see that breathing the stuff in can kill you. Also it appears that allowing it to sit on your skin and soak in will have ill effects. I'll let you read the rest.Further note: if it worked on people like it worked on ants, as soon as it touched a persons skin they would begin to have seizures and stop breathing shortly after that. Luckily it does not affect us like that.