A normal DVD player uses a 650nm laser to read details from the surface of a dis

ID: 1507547 • Letter: A

Question

A normal DVD player uses a 650nm laser to read details from the surface of a disk, on which up to 4.7 GB of data can be stored.

An HD DVD player uses a 405nm laser in connection with disks that can store up to 15 GB of data.

The newer Blu-Ray technology uses a 405nm laser and can store up to 25 GB on a disk.

Which of the following are true?

1. A higher frequency laser can detect finer surface details

2. The normal DVD laser is green

3. More data means fine surface details

4. The "D" in the Rayleigh formula is approximately inversely proportional to the amount of data on the disk.

5. The Blu-Ray DVD laser is blue

TRUE , a wave can't decern details smaller than it's wavelength.

FALSE it's red

TRUE although it's the other way around, finer surface details allow for more data

FALSE the Rayleigh number (and the formula to calculate it) is related to fluid flow

TRUEISH (it's blue violet)

So, Answer is : 1,3,5 are TRUE

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