Which specific optical storage standard uses a shorter wavelength blue-violet laser to read and write data, allowing for significantly higher data density? MCQ with Answer and Explanation
Which specific optical storage standard uses a shorter wavelength blue-violet laser to read and write data, allowing for significantly higher data density?
A. DVD-R
B. CD-ROM
C. Blu-ray Disc
D. Magnetic Tape
Answer: Option C
Solution (By JKSSB Mock Tests)
Blu-ray discs use a 405nm blue-violet laser, which has a shorter wavelength than the red lasers used in DVDs and CDs, allowing it to focus on smaller pits and pack more data.
Explanation:
DRAM stores data using capacitors, which lose charge over time. This design requires continuous refreshing cycles, introducing latency that makes it slower than SRAM.
Explanation:
Under decimal SI metrics (often used by storage manufacturers), mega- means exactly one million ($10^6$), so 1 Megabyte equals exactly 1,000,000 Bytes.
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