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identify the type of function represented by f(x)=2(1/2)^x?
exponential decay
What do x-rays have to do with radioactive decay?
nothing
Does f(x)10x grow or decay?
It grows.
Are x-rays emitted during radioactive decay?
Yes they are. Nearly all kinds of electromagnetic radiation are emitted during radioactive decay
Factor of 4/7^x?
0.5714
What type of particles is released during beta decay?
In beta- decay, an electron and an electron antineutrino is emitted. In beta+ decay, a positron and an electron neutrino is emitted. In both types of decay, if the nucleus is left in an excited state, when it comes back down to ground state, it emits a photon in the form of a gamma ray. In beta+ decay that is precipitated by K Capture, the electron cloud is left in a multi level excited state, and it has one or (usually) more drops in energy as it returns to ground state, each drop emitting a photon in the form of an x-ray.
How is tooth decay diagnosed?
X rays may be taken to confirm the presence and extent of the decay. The dentist then makes the final clinical diagnosis by probing the enamel with a sharp instrument.
Are there cavities an X-ray can not see?
Absolutely! X-rays are simply a tool the dentist uses to diagnose dental disease. He also uses an instrument called an explorer to help him find decay that would otherwise be hidden. X-rays cannot see through metal. Therefore, if decay is present around an old crown or filling, it probably will be hidden on the x-ray. X-rays are also often useless in detecting decay on the surface of the tooth directly facing the x-ray. If you doubt your dentist, please get a second opinion. Its your right, and its your mouth!
What are the different kinds of teeth cavities?
A tooth has many surfaces and some people describe the decay by where it is on the tooth. The cavities the dentist can see by a clinical exam are on the chewing surfaces of the teeth and on the gumline area. There are some tooth decay cavities that are formed between the teeth due to lack of flossing. For these cavities, the dentist must take an x-ray to find them. You cannot see them by looking or feeling with the "pick". Another type of tooth decay is something that happens to an injured tooth called "internal resorption". The dentist also needs to take an x-ray to find this, unless the decay eats it way out of the tooth and shows at the gumline.
What is the half life of Bismuth-209?
It's about 2 x 1019 years by alpha decay.
How do you find the decay factor?
To find the decay factor, you need to know the formula y=ab^x where "a" is the initial amount and "b" the growth or decay factor. It is a growth factor if the number next to "a" is bigger than 1, b>1, and it is usually in (). For example y=12(1.3)^x notice that (1.3) is bigger than 1 so it is a growth factor. The decay factor is "b" the same as growth factor but only that b
What does the word decay factor mean?
Some quantities decrease by a fixed proportion (not fixed amount) in each time period. Typical examples used in school mathematics are depreciation or radioactive decay. The value of an asset (often a car) is assumed to lose x% of its value every year. That is, at the end of each year, its value is (1-x/100) times what it was a year earlier. Similarly, radioactive substances lose y% of their mass through nuclear decay in each time period. The factor (1-x/100) is known as the decay factor.
