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can any1 pls gimme the advantages and disadvantages of AM and FM transmissions?????
pleaseeeeeeeeeeeeeeeeeeeeeeeee
pleaseeeeeeeeeeeeeeeeeeeeeeeee
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Disadvantages of AM: Lacks higher frequencies that affect the music qualitycan any1 pls gimme the advantages and disadvantages of AM and FM transmissions?????
pleaseeeeeeeeeeeeeeeeeeeeeeeee
(i) positive charge will attract back the electrons that want 2 escape (unlike charges) hence no loss of chargeIn a laboratory demonstration of the photoelectric effect, a metal plate is given an electric charge and light of various wavelengths is shone on to the surface of the plate in turn. It is found that the plate loses its electric charge when the plate is given a negative charge and when ultraviolet light is shone on to the plate.
Explain why the plate does not lose its charge when
(i) the plate is given a positive charge and illuminated by ultraviolet light,
(ii) the plate is given a negative charge and illuminated by visible light.
(4)
nice one ..and i got the answer to that question !!!(i) positive charge will attract back the electrons that want 2 escape (unlike charges) hence no loss of charge
(ii) Visible light has a lower frequency, and hence lesser energy, than UV light... thus it cannot provid the electrons it interacts with enough energy for them to break free and hence there is no discharge
thanxnice one ..and i got the answer to that question !!!
did you check the examiner report?? Which question?? How can emission occur at any frequency?? It occurs at the threshold frequency or above it!i cant understand the ms point that for wave enrgy cn be continuosly collected so emission shud occur at all frequencies.....the cnfusion is that in case of photon also energy is being collected as it is converted into thermal enrgy if below threshold.....so wats the difference?
Ep is zero at mean position and max at amplitude. there will be no graph in negative region as energy is scalar. So, the graph will be like we get in full-wave rectification of a.c current.can anyone clear away my confusion in this question?? M/J 2004 question 4 (b) (paper 4)
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If 'Ep is max at amplitude' then shouldn't the graph be like cos(x)..?? .. but being above time-axis...!!Ep is zero at mean position and max at amplitude. there will be no graph in negative region as energy is scalar. So, the graph will be like we get in full-wave rectification of a.c current.
Yes..the graph of y is actually cos(x) graph. so Ep graph will be just like that without being below time-axis.If 'Ep is max at amplitude' then shouldn't the graph be like cos(x)..?? .. but being above time-axis...!!
http://www.youtube.com/results?sear...9.0.1870998.22.22.0.11.11.0.194.1371.4j6.10.0.Anyone knows good links or videos about operational amplifiers??
Its like a cosine graph but you flip the negative side on to the positive side. Just like when you connect 4 diodes to obtain full wave recitfication!Yes..the graph of y is actually cos(x) graph. so Ep graph will be just like that without being below time-axis.
thats wat it shud look like roughly.....can anyone clear away my confusion in this question?? M/J 2004 question 4 (b) (paper 4)
View attachment 8001 )
since the mass is removed..the system oscillates with even more amplitude than before..but this makes the wavelength go small..!!thats wat it shud look like roughly.....
by the way in the last part of this question shudnt the amplitude be smaller also
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