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LoginDebrief - Physics (H1 8866/02) (H2 9745/3)
55 posts
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i took H1 paper today! comparing other sch prelim and mine hor.. A lvl one is much more harder and totally unexpected questions came out! my teacher say those questions were challenging ones, i felt that the paper got so many explain and describe questions.. zzz
how about u guys, how u thought of the H1 Physics paper if u took it?
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Q4. Discuss any energy changes that take place.
(a) A mass suspended in a Spring, oscillating vertically.
(b) A radioactive nucleus undergoing decay.
(a) is okay. (b) I can only think of mass defect and binding energy. No idea why 4 marks ?
Seriously I think this year is like a 'guinea pig' year where they test out new syllabus. Hope the other papers turn out well though.
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Originally posted by RaaRaa:Q4. Discuss any energy changes that take place.
(a) A mass suspended in a Spring, oscillating vertically.
(b) A radioactive nucleus undergoing decay.
(a) is okay. (b) I can only think of mass defect and binding energy. No idea why 4 marks ?
Seriously I think this year is like a 'guinea pig' year where they test out new syllabus. Hope the other papers turn out well though.for mass oscillating on spring, have to talk abt elastic potential energy of spring, kinetic energy and gravitational potential energy of the mass.
for the radioactive decay i m not sure. i talked abt mass lost as energy, loss in total binding energy, kinetic energies of daughter nuclei and alpha/beta particle as well as some energy in the form of a gamma ray photon.
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I didn't do the question but I know the answer that should be written
1) Using the wave theory, there should be a time lag for the transmission of energy from light to photoelectrons. However, photoelectric experiments show no detectable time lag in transmission of energy, hence the incoming source of energy is not a wave and should be a particle.
2) The energy of photoelectrons emitted should be dependent on intensity using wave theory. However, stopping potential is independent of wave intensity and depends on frequency instead.
3) Using wave theory, photoelectric emission should occur for all frequencies. However, photoelectric emission only occurs above the treshold frequency, hence wave theory does not work here.
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The one on photoelectric effect and how it accounts for the
particulate nature of light.
