0
What is the property of certain substances to absorb radiation of one frequency and to reemit radiation of lower frequency?
Wiki User
∙ 16y ago
This one is fluorescence. The example of high-lighters is that they absorb UV light (so-called "black light") and re-emit at the visual range, yellow, pink, orange. UV is a higher frequency than visible light.
Just so you know, there is no process where something absorbs low-frequency and re-emits at a high frequency.
The same idea, light being absorbed and re-emitted at a different frequency - has two main types. If it happens immediately, it is "fluorescent" (think highlighters in a black light) If there is a delay, it is "phosphorescence." Both effects and the delay in the second, are the result of quantum mechanics.
Wiki User
∙ 16y ago
Add your answer:
Earn +20 pts
What did madam curie do?
Marie Curie was famous for discovering a new element polonium and she was the first women to win a Nobel prize
Does ultraviolet rays in electro magnetic radiation causing certain substances to fluoreste?
Yes. The cool thing about this phenomena is that you can't see ultraviolet light, but it often causes EM radiation in the visible spectra, so it's kind of like the visible from the invisible...spooky.
What cell part allows only certain substances to difuse into and out of the cell?
The cell's membrane allows only certain substances to diffuse in and out of the cell.
Nuclear medicine techniques work through the detection of this kind of radiation injected into the body by adding a radioisotope to a certain drug?
Gamma rays are a type of radiation. Nuclear medicine techniques work through the detection of this kind of radiation injected into the body by adding a radioisotope to a certain drug.
How do certain substances affect the pH level of tap water?
Acidic substances will lower pH and more alkaline or basic substances will put it above the neutral value of pH = 7
Exposing certain substances to radiation is known as?
irradiation
The property of only allowing certain substances to move through it?
Selective permeability
Definition of fluorescence?
The visible or invisible radiation emitted by certain substances as a result of incident radiation of a shorter wavelength such as X-rays or ultraviolet light.
What kind of electromagnetic radiation causes certain substances to fluoresce?
Ultraviolet waves of certain wavelengths kill bacteria, tan your skin, and produce the effect known as fluorescence. pg 52 of your textExamples: ultraviolet radiation, visible light.
Can new substances be formed when you observed a chemical property?
Yes, and here is the reason: The Definition of a chemical property is a property in which a substance has a potential to change Identity under certain circumstances in that manner of chemical change. If this substance changes identity, then new substances are produced from the matter that was changed.
Does the speed of the wave increase as you move from left to right on the electromagnetic spectrum?
No. As the radiation frequency moves from left to right in the frequency spectrum, the wave speed is the same in a certain medium -- in vacuum, it is 3E8 m/s. The energy increases with frequency, though.
How does frequency vary different forms of electromagnetic radiation?
We call light electromagnetic radiation with certain frequencies; higher frequencies and we call it Ultra violet, X-rays and gamma radiation. Frequencies lower than light we call infra red, and radio.
What produces light?
Certain substances produce light when they are illuminated by more energetic radiation, a process known as Fluorescence. Some substances emit light slowly after excitation by more energetic radiation. This is known as Phosphorescence
Is there a cure for nuclear radiation?
We do not have medications or treatment that can cure the damage caused by radiation. There are things we can do, however, to limit the destruction caused by radioactive substances a person has been exposed to. We cam limit the damage done to a person who has been exposed to certain radioactive substances, such as radioactive iodine, by providing non-radioactive alternatives to the body to take up. This is what iodine tablets are for. Given enough safe iodine, the body will take up little of the iodine that is radioactive, and will eliminate it. We can treat radiation sickness, but this does not treat the underlying radioactivity. There are ways of removing certain radioactive substances from the body.
How do you define light?
Either as: A particle, the photon, A packet of energy, the quantum of electromagnetism(still known as the photon), and A wave of a specific frequency, a wave of radiation that has a certain energy
What did madam curie do?
Marie Curie was famous for discovering a new element polonium and she was the first women to win a Nobel prize
How do stars use frequencies?
The electromagnetic radiation (including light) have frequencies. Stars may also pulsate (get larger and smaller, and thus brighter and less bright) at a certain frequency.
