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please guide me...?
A flat sheet of **crystalline quartz** has a thickness of 3.8 cm. It is on top of a flat sheet of diamond that has a thickness of 2.5 cm. Light strikes the crystalline quartz perpendicularly and travels through it and then through the **diamond**. In the time it takes the light to travel through the two sheets, how far would it have traveled in a vacuum?
?cm
n=C/v
v=veloctiy
c=3.0 x 10 ^8
n= index of refraction
quartz(n)= 1.544
diamond (n)=2.419
v(q) = c/n(q) = 0.648c
t(q) = d(q)/v(q) = 0.038/0.648c = 0.0587 light-second
v(d) = c/n(d) = 0.413c
t(d) = d(d)/v(d) = 0.025/0.413c = 0.0605 light-second
The distance light would have travelled in
t = t(q) + t(d) = 0.1191 light-seconds
d(vacuum) = ct = 0.1191 meters
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Carry On Luggage Guide And What Not To Pack Travel Tips
You can do away with checked baggage but almost never with carry-on luggage. These days most airlines are advising passengers to limit their baggage on a single carry-on bag.
It will not only save them time in the airport, it will also dramatically reduce risks of losing a luggage. However, due to security issues, you can't bring anything that strikes your fancy. You want to know what are allowed and what are prohibited. It'll help you move along on your trip smoothly and avoid a possible trip to the airport's interrogation room.
Different airlines have different carry-on luggage allowance. Check from your airline the maximum allowable size and weight of carry-on luggage. You want to make sure that you will not exceed the limit; otherwise, you can't refuse if they require you to gate check your baggage. Airlines also allow certain items that can be carried along with your carry-on bag such as an umbrella, a laptop bag and a book. Check on these as well so that you will not have to stuff them all in a single bag.
Hazardous and flammable materials are all out. If the item poses a threat to the health and well being of passengers or the safety and security of the airplane, it is most likely to be banned from the vicinity of the aircraft. Explosives, gases, pressure containers, infectious materials, radioactive and magnetic materials, poison, corrosives and other dangerous items are prohibited.
Take note that even replicas of explosives and flammable items are also banned. To those who can't leave home without a pepper spray, make an exception when going to the airport for your flight. It's a prohibited item; so, you're better off if you leave it at home.
When bringing along liquids, gels or aerosols take note of the allowed numbers. The amount per liquid, gel or aerosol should not be more than 3 ounces (or 100 ml), all of them combined should fit in 1 quartz of clear plastic bag and 1 person is allowed only one of these bags. To easily remember the rule, think of 3-1-1 as your carry-on safety tenet.
Also note that liquids are not just limited to your toiletries and bottled water. Even sauces, syrups and jams are also included. Liquid in gift items such as snow globes should also not go beyond the 3 ounces limit.
Parents traveling with babies or individuals with medical conditions need not worry. Formula, bottled breast milk and infant food as well as prescriptions in the form of liquids, gels and aerosols are exempted from the 3-1-1 rule.
It is recommended to pack a smaller foldable bag in your carry-on luggage. Airlines allow only a limited number and weight of carry-on luggage. Once they have reached their limit, other passengers may be required to check-in their carry-on luggage.
When this happens, you can easily dig up and remove your personal essentials - e.g. prescriptions, toiletries, important documents, eyeglasses and money-related items- place them in your contingency bag and bring them with you on the plane.
The Globe Cheap Travel Guide reveals how anybody can take advantage of money saving Travel Tips, through travel secrets previously only known within the travel industry.
Get your FREE copy of the Globe Cheap Travel Report now by visiting www.GlobeCheap.com
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