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Re: Physics Help here! Stuck somewhere?? Ask here!
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Re: Physics Help here! Stuck somewhere?? Ask here!
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sorry but i'm an olevel student!!!!!!!1Need help in (9702/s07/qp4) Q:3 part b plz show working with explanation
minima is formed by complete destructive interference and for that to occur it must be in phase and the amplitudes should such that it cancels each other hope i could helpView attachment 21350View attachment 21351
I've attached the questions:
The question is c)ii, the mark scheme says that the wave is reflected off of other surfaces, which I understand, but it also says that the path difference decreases and that the amplitude decreases which I don't get. What do they mean by a decreasing path difference and amplitude and how does it relate to minima? Can it be explained by relating it to the scenario in the diagram (ie difference when the mic close to the speaker and as it moves away) and the minima-maxima graph?
I thought that in phase waves cause constructive interference? and I understand that but what does the amplitude and path difference have to do with it?minima is formed by complete destructive interference and for that to occur it must be in phase and the amplitudes should such that it cancels each other hope i could help
Plus, how could te amplitudes at the minima even decrease because I thought that it must always be 0?!minima is formed by complete destructive interference and for that to occur it must be in phase and the amplitudes should such that it cancels each other hope i could help
sorry about the phase stuff i wanted to write there is a path difference which means they are out of phase and thus cant cancel each other completely i.e (destructive interference) and zero minima here means no sound is this possible??? when u are actually moving loud speaker towards microphoneI thought that in phase waves cause constructive interference? and I understand that but what does the amplitude and path difference have to do with it?
this minima is not the point where destructive interference takes place minima is also referred as the lowest point of a wavePlus, how could te amplitudes at the minima even decrease because I thought that it must always be 0?!
here u goplease helpp!! :/View attachment 20937
Percentage Uncertainty = (0.5 + 0.5)/60 x 100 = 1.6666 = 1.7 (2s.f)A thermometer can be read to an accuracy of ± 0.5 °C. This thermometer is used to measure a
temperature rise from 40 °C to 100 °C.
What is the percentage uncertainty in the measurement of the temperature rise?
A 0.5 % B 0.8 % C 1.3 % D 1.7 %............. THANKS IN ADVANCE
Can you please tell me the uncertainities of all instruments to be used in phy and chem labs? I have been searching for them and with no luck. Like stopwatch having typical uncertainity of 0.2 due to human error .Percentage Uncertainty = (0.5 + 0.5)/60 x 100 = 1.6666 = 1.7 (2s.f)
uncertainities of all instruments in phy are taken as their least counts eg. 0.1 mm in vernier caliperCan you please tell me the uncertainities of all instruments to be used in phy and chem labs? I have been searching for them and with no luck. Like stopwatch having typical uncertainity of 0.2 due to human error .
But why (0.5+0.5)Percentage Uncertainty = (0.5 + 0.5)/60 x 100 = 1.6666 = 1.7 (2s.f)
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