- Messages
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hhhmmmm.....okay.thanks.
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lemme check the answers,i'll get back to u in a while.there's some kinda confusion.First one: D because gamma ray is most penetrating and shorter half life as its harmful
Second one: C because of they can travel the most, aplha has a range of few centimeters while beta has range of 10 cm. And shorter half life as its harmful.
sure do!lemme check the answers,i'll get back to u in a while.there's some kinda confusion.
well...checked the mark scheme....the answer to 1 is A....u can check it urself if u want to...it's q39-p1-j08.sure do!
and if u have confusion then i can explain it again
yeah my bad! Actually the reason for it being A was due to the fact that gamma rays have most penetrative powers so the rays can go through the body and enter into the brain.well...checked the mark scheme....the answer to 1 is A....u can check it urself if u want to...it's q39-p1-j08.
as for 2....i cudn't verify its answer as the year under this question is incorrect (in my redspot topical)
thanks for the help anyways.
Okay ! Time to suit up people. I'm gonna ask a question regarding Physics A really technical question. So if you wanna check how much you know ... then try to answer it. Let's have 5 people guess the answer , if they're all wrong then I'll spill the answer. If anyone of them is right then they're right
So here's the question :
A glass prism , is placed on a grassy field for 3 weeks. On the 22nd day , the prism explodes and the grass catches fire. Why?
I know that the grass catches fire because the prism has exploded, releasing heat, so 5 marks there . As for the prism, I'd say, it might have something to do with the over-heating due to too much total internal reflection of light. Or, because the prism has refracted too much light towards the grass, the grass heated up too much, and caused the prism to explode. It's explosion causing the grass to catch fire.
Total internal reflection ONLY occurs if the angle of incidence is greater than critical angle. Only a few rays would be refracted internally. How can that set the grass on fire. The grass is in direct sunlight all day. Does it catch fire under normal conditions? And how can reflecting too much light cause the prism to explode. Think before you speak , your answers don't even make sense.
Anyone else try.
Chillax mate. It's only an opinion. Alright, how's about this one... you said, that the glass prism was in the open, not sunlight or cold weather. Well, that being said, it is safe to assume that temperature variations will be present, because 22 days is a lot of time, and the weather will not be the same for that period. Now, with that assumption, we can say, that the glass had expanded unevenly. That has caused it to break and explode. This explosion, causes the grass to catch fire.
Again, this is only an opinion. Might seem stupid to you, but you can try being nicer with your replies next time round. Condescension is implied in your tone.
Seriously man u CHillax, u guys are fighting such a senseless problem. Get a life man , no body is gonna ask you about wat would happen if u put prism (huh! ) in sunlight in your examsChillax mate. It's only an opinion. Alright, how's about this one... you said, that the glass prism was in the open, not sunlight or cold weather. Well, that being said, it is safe to assume that temperature variations will be present, because 22 days is a lot of time, and the weather will not be the same for that period. Now, with that assumption, we can say, that the glass had expanded unevenly. That has caused it to break and explode. This explosion, causes the grass to catch fire.
Again, this is only an opinion. Might seem stupid to you, but you can try being nicer with your replies next time round. Condescension is implied in your tone.
hahaha ok ! lol u seem so clever man ! =). Wrong again. It actually is a bit silly . Expansion is very minor in solids . It wont be like the prism becomes a skyscraper. Okay , say your right. The prism become hot and expanded. Then when the temp dropped it would crack due to compression. So it breaks. Even so , it's just glass. How can glass breaking set fire to the grass?
hahaha ok ! lol u seem so clever man ! =)
lol say it already ! !
Seriously man u CHillax, u guys are fighting such a senseless problem. Get a life man , no body is gonna ask you about wat would happen if u put prism (huh! ) in sunlight in your exams
So chill !!
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