Assignment Help

LennonCook · 03-15-2003, 04:47 PM

I need help answering these questions for my Physics assignment -
~~Identify the waves and transfers of energy that occur when using a mobile phone. (Worth 5 marks)~~
Identify methods of detecting: ~~Radio Waves~~, Radar, ~~X-Rays~~. (worth 3 marks)
~~List the following communications systems in order of increasing carrier wave frequency: Short wave radio, microwave phone links, FM Radio, AM radio, TV. (worth 2 marks)~~
~~Discuss the difference between analogue and digital transmission. (worth 2 marks).~~
Discuss the underlying physical principals used in CD Technology (worth 4 marks).

Thanks in advance. [img]smile.gif[/img]

Crossed off what we`ve now done. [img]smile.gif[/img]

[ 03-16-2003, 01:21 AM: Message edited by: LennonCook ]

SomeGuy · 03-15-2003, 06:56 PM

On a mobile phone I read somewhere they were radiation waves.... I think... Don't trust me.. I'm only 12. [img]tongue.gif[/img]

Snicker · 03-15-2003, 07:02 PM

Quote:

Originally posted by SomeGuy:
On a mobile phone I read somewhere they were radiation waves.... I think... Don't trust me.. I'm only 12. [img]tongue.gif[/img]

*snicker*

Hivetyrant · 03-15-2003, 10:57 PM

Someone please help us!!!!!
We really need helpon this assingment, we cant find information anywhere

LennonCook · 03-15-2003, 11:02 PM

And remember - we`re teenagers... assignment is due in two days time.

Sir Heinrich Godfrie IV · 03-15-2003, 11:35 PM

Well as for the question, "Discuss the difference between analogue and digital transmission."
Analog signals are basically electromagnectic waveforms and they fluctuate and change continuosly. Where as digital signals change from one state to another almost instantaneously, similar to ones and zeros or on and off. Digital signals are less vulnerable to errors from interference (caused by flouresent lighting near a cable). Oh, and anolog is less vulnerable to attenuation (or signal loss) from say, the length of a cable.
There is also differences in how the two are measured, but I don't know if you need to that. I hate to say it but that's about all I can answer from your said questions.

Sir Heinrich Godfrie IV · 03-16-2003, 12:06 AM

Also, you may want to check out, howstuffworks.com it is an awesome website that will explain any thing from how a nuclear bombs works to how the U.N. functions. I just got done snoopin' around the site and saw that it may be able to answer some of your other questions.
Also, you may want to try, pcguide.com as it seems that some of your questions fall under the realm of computer and networking technology.
You may just want to go ahead and make some simple queries on a search engine like askjeeves.com or google, you will often find links to webpages/sites of a science/physics professor who documents his lab procedures and or past lectures.
Good luck!

LennonCook · 03-16-2003, 12:47 AM

Thanks, Sir Heinrich. [img]smile.gif[/img]

Sir Heinrich Godfrie IV · 03-16-2003, 01:27 AM

You're very welcome.
Oh and I saw that you still need more information regarding compact discs, here is a link that should shed some light on that topic.
http://www.howstuffworks.com/search.php
It's the results from a search that I made on that site, the middle column of that page ought to give you all the info you need regarding CDs.

03-15-2003, 06:56 PM	#2
SomeGuy Unicorn Join Date: May 14, 2002 Location: Oklahoma, USA Age: 33 Posts: 4,238	On a mobile phone I read somewhere they were radiation waves.... I think... Don't trust me.. I'm only 12. [img]tongue.gif[/img] __________________ \"I firmly believe that any man\'s finest hour, the greatest fulfillment of all that he holds dear, is the moment when he has worked his heart out in a good cause and lies exhausted on the field of battle - victorious.\"<br />-Vince Lombardi

03-15-2003, 11:35 PM	#6
Sir Heinrich Godfrie IV Zhentarim Guard Join Date: May 19, 2002 Location: Land of 10,000 Lakes (Minneapolis, MN, USA) Age: 42 Posts: 315	Well as for the question, "Discuss the difference between analogue and digital transmission." Analog signals are basically electromagnectic waveforms and they fluctuate and change continuosly. Where as digital signals change from one state to another almost instantaneously, similar to ones and zeros or on and off. Digital signals are less vulnerable to errors from interference (caused by flouresent lighting near a cable). Oh, and anolog is less vulnerable to attenuation (or signal loss) from say, the length of a cable. There is also differences in how the two are measured, but I don't know if you need to that. I hate to say it but that's about all I can answer from your said questions. __________________ \"The Earth is NOT your Mother!\"<br /><br />\"The chief cause of failure is trading what we want most, for what we want at the moment.\"<br />-Unknown

03-16-2003, 12:06 AM	#7
Sir Heinrich Godfrie IV Zhentarim Guard Join Date: May 19, 2002 Location: Land of 10,000 Lakes (Minneapolis, MN, USA) Age: 42 Posts: 315	Also, you may want to check out, howstuffworks.com it is an awesome website that will explain any thing from how a nuclear bombs works to how the U.N. functions. I just got done snoopin' around the site and saw that it may be able to answer some of your other questions. Also, you may want to try, pcguide.com as it seems that some of your questions fall under the realm of computer and networking technology. You may just want to go ahead and make some simple queries on a search engine like askjeeves.com or google, you will often find links to webpages/sites of a science/physics professor who documents his lab procedures and or past lectures. Good luck! __________________ \"The Earth is NOT your Mother!\"<br /><br />\"The chief cause of failure is trading what we want most, for what we want at the moment.\"<br />-Unknown

03-16-2003, 01:27 AM	#9
Sir Heinrich Godfrie IV Zhentarim Guard Join Date: May 19, 2002 Location: Land of 10,000 Lakes (Minneapolis, MN, USA) Age: 42 Posts: 315	You're very welcome. Oh and I saw that you still need more information regarding compact discs, here is a link that should shed some light on that topic. http://www.howstuffworks.com/search.php It's the results from a search that I made on that site, the middle column of that page ought to give you all the info you need regarding CDs. __________________ \"The Earth is NOT your Mother!\"<br /><br />\"The chief cause of failure is trading what we want most, for what we want at the moment.\"<br />-Unknown

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03-15-2003, 04:47 PM	#1
LennonCook Jack Burton Join Date: November 10, 2001 Location: Bathurst & Orange, in constant flux Age: 37 Posts: 5,452	I need help answering these questions for my Physics assignment - ~~Identify the waves and transfers of energy that occur when using a mobile phone. (Worth 5 marks)~~ Identify methods of detecting: ~~Radio Waves~~, Radar, ~~X-Rays~~. (worth 3 marks) ~~List the following communications systems in order of increasing carrier wave frequency: Short wave radio, microwave phone links, FM Radio, AM radio, TV. (worth 2 marks)~~ ~~Discuss the difference between analogue and digital transmission. (worth 2 marks).~~ Discuss the underlying physical principals used in CD Technology (worth 4 marks). Thanks in advance. [img]smile.gif[/img] Crossed off what we`ve now done. [img]smile.gif[/img] [ 03-16-2003, 01:21 AM: Message edited by: LennonCook ]

03-15-2003, 10:57 PM	#4
Hivetyrant Jack Burton Join Date: August 24, 2002 Location: Aussie now in the US of A! Age: 37 Posts: 5,403	Someone please help us!!!!! We really need helpon this assingment, we cant find information anywhere

03-15-2003, 11:02 PM	#5
LennonCook Jack Burton Join Date: November 10, 2001 Location: Bathurst & Orange, in constant flux Age: 37 Posts: 5,452	And remember - we`re teenagers... assignment is due in two days time.

03-16-2003, 12:47 AM	#8
LennonCook Jack Burton Join Date: November 10, 2001 Location: Bathurst & Orange, in constant flux Age: 37 Posts: 5,452	Thanks, Sir Heinrich. [img]smile.gif[/img]

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