Violet Blue Laser A laser emits photons having energy 3.74x10^-19 j, whats color would be expected for the light emitted?
c=3.00x10^8 m/s
h=6.63x10^-34 j.s
a. violet
b. blue
c. green
d. yellow to orange
e. orange to red
Hi,
We need to find out the wavelength of photons at that energy using E=hc/gamma:
gamma = hc/E = (6.63x10^-34 j.s) * (3.00x10^8 m/s) / (3.74x10^-19 j)
= 5.32x10^-7 m = 532 nm
532 nm corresponds to a visible light having the color: GREEN
(see link under sources for color chart)
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What is The Blue Ray Disc
What is Blu-ray?
Blu-ray, also known as Blu-ray Disc (BD) is the name of a next-generation optical disc format. The format was developed to enable recording, rewriting and playback of high-definition video (HD), as well as storing large amounts of data. The format offers more than five times the storage capacity of traditional DVDs and can hold up to 25GB on a single-layer disc and 50GB on a dual-layer disc.
Who developed Blu-ray?
The name Blu-ray is derived from the underlying technology, which utilizes a blue-violet laser to read and write data. The name is a combination of "Blue" (blue-violet laser) and "Ray" (optical ray). According to the Blu-ray Disc Association the spelling of "Blu-ray" is not a mistake, the character "e" was intentionally left out so the term could be registered as a trademark. The correct full name is Blu-ray Disc, not Blu-ray Disk (incorrect spelling) The correct shortened name is Blu-ray, not Blu-Ray (incorrect capitalization) or Blue-ray (incorrect spelling) The correct abbreviation is BD, not BR or BRD (wrong abbreviation)
Blue Ray Disc Technology
Blu-ray, also known as Blu-ray Disc (BD), is the name of a next-generation optical disc format jointly developed by the Blu-ray Disc Association (BDA), a group of the world's leading consumer electronics, personal computer and media manufacturers (including Apple, Dell, Hitachi, HP, JVC, LG, Mitsubishi, Panasonic, Pioneer, Philips, Samsung, Sharp, Sony, TDK and Thomson). The format was developed to enable recording, rewriting and playback of high-definition video (HD), as well as storing large amounts of data. The format offers more than five times the storage capacity of traditional DVDs and can hold up to 25GB on a single-layer disc and 50GB on a dual-layer disc. This extra capacity combined with the use of advanced video and audio codecs will offer consumers an unprecedented HD experience.
While current optical disc technologies such as DVD, DVD±R, DVD±RW, and DVD-RAM rely on a red laser to read and write data, the new format uses a blue-violet laser instead, hence the name Blu-ray. Despite the different type of lasers used, Blu-ray products can easily be made backwards compatible with CDs and DVDs through the use of a BD/DVD/CD compatible optical pickup unit. The benefit of using a blue-violet laser (405nm) is that it has a shorter wavelength than a red laser (650nm), which makes it possible to focus the laser spot with even greater precision. This allows data to be packed more tightly and stored in less space, so it's possible to fit more data on the disc even though it's the same size as a CD/DVD. This together with the change of numerical aperture to 0.85 is what enables Blu-ray Discs to hold 25GB/50GB.
About the Author
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“The mistake people are making is that they are perpetuating the idea that outlets like ABC News still respects the lines between fact, opinion and editorial that Violet Blue calls on vloggers and bloggers with the goal of fairness and accuracy to respect.”
I think you're completely incorrect in this regard. One of the main reasons people like Violet Blue call on vloggers, bloggers and casters to respect fairness and accuracy is because as a community we recognize the liberties taken by and failures of mainstream news outlets.
This is why people like Amanda Congdon are so violently repulsive to our community. They are the mainstream media's attempt at colonizing the blogging world and extending their creeping bloat, while at the same time undermining the attempts of this community towards legitimacy and acceptance.
And yes it is Congdon's fault. Congdon has done everything willingly. That's not to say mainstream media isn't ALSO to blame. But she is most definitely guilty of her own actions.
“The mistake people are making is that they are perpetuating the idea that outlets like ABC News still respects the lines between fact, opinion and editorial that Violet Blue calls on vloggers and bloggers with the goal of fairness and accuracy to respect.”
I think you're completely incorrect in this regard. One of the main reasons people like Violet Blue call on vloggers, bloggers and casters to respect fairness and accuracy is because as a community we recognize the liberties taken by and failures of mainstream news outlets.
This is why people like Amanda Congdon are so violently repulsive to our community. They are the mainstream media's attempt at colonizing the blogging world and extending their creeping bloat, while at the same time undermining the attempts of this community towards legitimacy and acceptance.
And yes it is Congdon's fault. Congdon has done everything willingly. That's not to say mainstream media isn't ALSO to blame. But she is most definitely guilty of her own actions.