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A flashlight simply emits light. The light contains no information other than to provide light so people can see where they are going.
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How do you create a laser beam?
A: By applying to a laser diode pulse of current enough energy to emit photons at a certain frequency.
Is light emitting diodes emit visible light when forward biased?
It depends on the particular LED. Some of them emit infrared light. But, yes, emission occurs when forward-biased.
Words with e prefix?
the answer is emit! cool ha eha eyo esave
Do rfid tags emit radiation?
Some RFID tags emit electromagnetic radiation, which, unlike ionizing radiation (think nuclear bombs), is not deadly (or at least we think its not--the debate about cell phones and brain cancer rages on). However, some RFID tags only emit a signal when they are electromagnetically "stimuated" by an external source. Usually the source is some sort of electromagnet which, through induction, "powers up" the tag and allows it to send the required data.
Why must you turn off electronics during airplane takeoff?
The reason they don't want you using personal electronics during takeoff and landing is that most personal electronics, even though they're shielded and not supposed to emit much, emit certain amounts of RFI (Radio Frequency Interference). While one or two devices might not interfere, a lot of them could interfere with aircraft pilot-ground communications, which is critical during takeoff and landing, when the aircraft is most vulnerable. If there is an emergency, the pilot needs to have clear communication with the Air Traffic Controller for emergency instructions and other necessary coms. Cell Phones and Notebooks are the biggest RFI and EMI (electromagnetic interference) offenders - even though they're shielded, they still emit quite a bit of interference, and cell phones by their nature could theoretically directly overlap an emergency com frequency that the pilot is using. If you've ever noticed the bulge cylinder on the end of some computer and AC adapter cables, that's a device specifically designed for RFI reduction. But not all cables have those. On another note, any fuel leak vapors during takeoff and landing could also be set off by the use of personal electronic devices if the plane were forced to abort the takeoff and a tank ruptured, though RFI is the primary concern. Same if the plane had a hard landing that resulted in a wing tank rupture and subsequent fuel leak. It's the same reason you're asked to turn your cell phones off while fueling your car.
What does the brightness of light depend on?
The ultraviolet light contains photons of high energy. these are able to excite the atoms. which during the process of de-excitation can emit frequencies , which are detectable by normal eye. So it depends upon frequency of light..
Which waves have the highest frequency?
Gamma rays emit the highest frequency.
What range of frequency of sound do coal trains emit when moving?
The range of frequency of sound that coal trains emit when moving hovers around 20 Hz to 20,000 Hz
What wavelength or frequency do people emit?
its proven people emit light in very small rations that vary throughout the day, we probably emit a lot more frequencies we have no idea about because our minds can only decipher the frequency of visible light.
Which star will emit the shortest wavelength of its peak frequency?
Blue star
Does a hot object emit photons with a longer wavelength than cold objects?
nopes, shorter. hot object will emit photons at high frequency (=blue flame for example, short WL) and cold object will emit photons at lower frequency (=IR for example which our bodies emit, long WL)
Does a blackbody emit all its radiation at a single frequency?
No. No natural object emits all its radiation at just one frequency.
What is the frequency of humans?
Average healthy individuals emit frequencies from 52HZ to 72HZ.
Does a flashlight emit one beam or many beams of light?
Depends on the flashlight, some have many bulbs which would probably shine brighter, or just one big bulb which depending on the bulb, might shine less bright.
Whenever a source of sound moves the frequency heard by the observer is Less than that of the source?
To be more specific, a sound source moving toward you will appear to emit a sound of higher frequency than actual. Conversely, a sound source moving away from you will appear to emit a sound of lower frequency than actual. See "the Doppler effect."
Do ferrets use echolocation?
Not per se. Echo location requires the animal to emit high frequency sounds then tracking targets by the reflection of that sound. Dogs do not emit high frequency sounds, but do have acutely sensitive hearing, and are able to track by distinguishing the direction from which sound originates.
When the flashlight is turned on electrical energy is changed to which type of energy?
Heat to make the filament glow white hot and emit light (electromagnetic radiation).
