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What is the property of certain substances to absorb radiation of one frequency and to reemit radiation of lower frequency?
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.
What else can I help you with?
What Does Radioactiveness mean?
A material that emits radiation Like Uranium, Plutonium, Radium, etc
This type of radiation lies just outside the high-frequency end of the visible spectrum?
Ultraviolet radiation lies just outside the high-frequency end of the visible spectrum. It has shorter wavelengths and higher energy levels than visible light, which makes it invisible to the human eye but can still cause damage to skin and eyes. UV radiation is commonly emitted by the sun and certain artificial sources like tanning beds.
What does fluoresce mean?
Fluoresce means to emit light or glow when exposed to ultraviolet radiation or certain wavelengths of light. This phenomenon is commonly seen in certain substances like fluorescent markers, minerals, or biological materials.
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 element protects us from radioactive substances?
Lead is a key element that protects us from radioactive substances due to its high density and ability to absorb and block radiation, particularly gamma rays and X-rays. Its effectiveness is why lead shields are commonly used in medical imaging and radiation therapy. Additionally, concrete and certain other materials can also provide protection, but lead remains one of the most effective choices for shielding against radiation.
Exposing certain substances to radiation is known as?
irradiation
What is the frequency at which mice hate certain scents or substances?
Mice can be sensitive to certain scents or substances, with some studies suggesting that they may dislike scents at frequencies above 20 kHz.
The property of glowing under ultraviolet light?
This property is known as fluorescence or phosphorescence, where certain compounds or materials emit light in response to UV radiation. It is commonly observed in substances like minerals, paints, and dyes, and has various applications in fields such as forensics, manufacturing, and entertainment.
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.
Why for a particular metal electrons are emitted only when the frequency of the incident radiation is greater than a certain value?
Electrons are emitted from a metal surface when the energy of the incident photons is great enough to overcome the work function of the metal. This minimum energy required is equivalent to a certain threshold frequency, known as the threshold frequency. Electrons can only be emitted when the frequency of the incident radiation is greater than this threshold frequency because lower frequency photons do not possess enough energy to overcome the work function and release electrons from the metal surface.
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.
Which one of the following types of electromagnetic radiation causes certain substance to floursce?
Ultraviolet radiation causes certain substances to fluoresce by exciting electrons in the substance to higher energy levels, which are then released as visible light.
What is the frequency of Beta radiation?
The frequency of beta radiation can vary depending on the specific beta particle emitted, but typically ranges from about 10^18 to 10^20 Hz. Beta particles are high-energy electrons or positrons that are emitted during certain types of radioactive decay.
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.
What Does Radioactiveness mean?
A material that emits radiation Like Uranium, Plutonium, Radium, etc
What does it mean for a membrane to be semipermeable and how does this property affect the movement of substances across it?
A semipermeable membrane allows certain substances to pass through while blocking others. This property affects the movement of substances across the membrane by selectively allowing only certain molecules or ions to pass through, based on their size, charge, or other properties. This helps regulate the flow of substances in and out of cells or compartments, maintaining balance and allowing for essential processes to occur.
Radioactivity is a tendency for an element or a material to?
Radioactivity is a property of certain elements or substances where they undergo spontaneous decay, emitting radiation in the form of particles or waves. This decay process can result in the release of energy and the transformation of the nucleus of the atom.
