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March 29, 2024, 02:32:14 am

Author Topic: HSC Physics Question Thread  (Read 1030453 times)  Share 

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Aaron12038488

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Re: Physics Question Thread
« Reply #1590 on: January 05, 2017, 02:49:37 pm »
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how did you study Swagadaktal

Aaron12038488

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Re: Physics Question Thread
« Reply #1591 on: January 06, 2017, 03:38:52 pm »
+1
Identify the electromagnetic wavebands filtered out by the atmosphere, especially UV, X-rays and gamma rays.
How should I go about answering this dot point.
Is this alright, any improvements.
    The sun is a producer of all the EM waves sending all bandwidth to Earth.
    The earth’s atmosphere has the ability to absorb any incoming energy EM radiation
    Ultimately only visible light, radio waves, and microwaves are able to reach the surface of the Earth
    Too much exposure to UV radiation can result in cancers and dangerous reactions
    Too much exposure to X-rays and gamma radiation would quickly kill us

Rathin

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Re: Physics Question Thread
« Reply #1592 on: January 06, 2017, 03:49:43 pm »
+1
Identify the electromagnetic wavebands filtered out by the atmosphere, especially UV, X-rays and gamma rays.
How should I go about answering this dot point.
Is this alright, any improvements.
    The sun is a producer of all the EM waves sending all bandwidth to Earth.
    The earth’s atmosphere has the ability to absorb any incoming energy EM radiation
    Ultimately only visible light, radio waves, and microwaves are able to reach the surface of the Earth
    Too much exposure to UV radiation can result in cancers and dangerous reactions
    Too much exposure to X-rays and gamma radiation would quickly kill us

I dont think you need that much detail as its an identify verb but it is good to know.

But this is also the relevant information you will need to know.
Radio Waves: Not Absorbed
Microwaves: Not Absorbed
Infrared: Partially Absorbed
Visible Light: Not Absorbed 
UV Ray: Absorbed
X Ray: Absorbed
Gamma Ray: Absorbed


« Last Edit: January 06, 2017, 04:27:38 pm by Rathin »
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jamonwindeyer

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Re: Physics Question Thread
« Reply #1593 on: January 06, 2017, 04:10:22 pm »
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Thanks for the awesome response Rathin! Good point on it being an 'Identify' dot point; you don't need heaps of additional info in an exam situation! Always play to the verb ;D

Aaron12038488

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Re: Physics Question Thread
« Reply #1594 on: January 06, 2017, 04:20:38 pm »
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rathin, did you just copy that from KC Notes?

Rathin

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Re: Physics Question Thread
« Reply #1595 on: January 06, 2017, 04:24:38 pm »
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rathin, did you just copy that from KC Notes?

Not sure, It copied directly from my Prelim Notes..I used many sources so It is a possibility.

Also, for this dot point the most I have seen while doing past papers in yr 11 was MC question which asked which of these rays are absorbed. So if you remember that Gamma Ray, X Ray and UV Ray are absorbed fully by the Atmosphere you will be fine.

« Last Edit: January 06, 2017, 04:51:48 pm by Rathin »
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jamonwindeyer

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Re: Physics Question Thread
« Reply #1596 on: January 09, 2017, 01:22:44 pm »
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Jamon are these decent notes so far?

Looks great to me! Very visual, no huge chunks of information, nicely done Aaron! :)

Aaron12038488

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Re: Physics Question Thread
« Reply #1597 on: January 09, 2017, 01:31:46 pm »
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Thanks  8)

katnisschung

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Re: Physics Question Thread
« Reply #1598 on: January 09, 2017, 05:13:45 pm »
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im having trouble visualising this... pls help!

the star ship enterprise Enterprise is stationary in space to make repairs to the warp
drive. Suddenly a Kinglon vessel appears from the right and flashes towards and past the Enterprise at half the speed
of light.
When it is exactly in front of the Enterprise, Captain Kirk fires port and starboard at the same time.

so this is how i interpreted it... (too lazy to upload a pic)

i have Enterprise stationary (on a planet) with Kinglon whizzing past going left...
and then i get lost with where the lasers are going...
get me out of here

Rathin

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Re: Physics Question Thread
« Reply #1599 on: January 09, 2017, 05:32:53 pm »
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im having trouble visualising this... pls help!

the star ship enterprise Enterprise is stationary in space to make repairs to the warp
drive. Suddenly a Kinglon vessel appears from the right and flashes towards and past the Enterprise at half the speed
of light.
When it is exactly in front of the Enterprise, Captain Kirk fires port and starboard at the same time.

so this is how i interpreted it... (too lazy to upload a pic)

i have Enterprise stationary (on a planet) with Kinglon whizzing past going left...
and then i get lost with where the lasers are going...

To the observer in the Kinglon the lasers go straight as they are in their own inertial reference frame (assumed constant motion). To an observer the laser has travelled the opposite direction in which Kinglon is travelling. I am also kinda confused on what the info is with all these weird names and unstructured info but here is my 2 cents..hope it helps.
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Aaron12038488

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Re: Physics Question Thread
« Reply #1600 on: January 09, 2017, 05:51:53 pm »
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for this dot point, do i have to talk about all three or can I just do Radio Waves?
Outline how modulation of amplitude or frequency of visible light, microwaves and/or radio waves can be used to transmit information

RuiAce

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Re: Physics Question Thread
« Reply #1601 on: January 09, 2017, 05:57:50 pm »
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for this dot point, do i have to talk about all three or can I just do Radio Waves?
Outline how modulation of amplitude or frequency of visible light, microwaves and/or radio waves can be used to transmit information
It is the same for all three of them.

Rathin

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Re: Physics Question Thread
« Reply #1602 on: January 09, 2017, 06:04:23 pm »
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for this dot point, do i have to talk about all three or can I just do Radio Waves?
Outline how modulation of amplitude or frequency of visible light, microwaves and/or radio waves can be used to transmit information

For this normally you either have to describe/explain/discuss AM and FM. So make sure you know how the carrier way has its Amplitude or Frequency modulated for information to be carried and make sure you have Advantages and Disadvantages for both and discuss questions are..no pun intended..very frequent. 
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katnisschung

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Re: Physics Question Thread
« Reply #1603 on: January 09, 2017, 06:37:49 pm »
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ok so probably a stupid question but
because the speed of light is absolute (3 x 10^8)
and light is an em wave its safe to assume
the speed of ALL EM waves are absolute
get me out of here

RuiAce

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Re: Physics Question Thread
« Reply #1604 on: January 09, 2017, 06:41:49 pm »
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ok so probably a stupid question but
because the speed of light is absolute (3 x 10^8)
and light is an em wave its safe to assume
the speed of ALL EM waves are absolute
Yes. The speed of all EMR is constant

Of course, when Einstein published his theory of special relativity, it discussed this matter with respect to visible light. But the nature of EMR allows this point to be strengthened into the fact that the speed of all EMR must be c. That being said, you should still refer to the speed of 'light' being constant, when writing 3 mark responses regarding special relativity.
« Last Edit: January 09, 2017, 06:54:00 pm by RuiAce »