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  1. ...with the same gravitational acceleration and hence same time for it to fall from a certain height.This is by the basic... equation is very simple so that you can look up from your physics book. If we do...

  2. (a) With human body temperature = 310 K, we have: λ = (2.9 x 10-3)/310 = 9.35 x 10-6 m which is beyond the visible light spectrum, in the infra red region. (b) With Sun's surface temperature = 6000 K, we have: λ = (2.9 x 10-3)/6000 = 4.83 x 10-7 m

  3. ... energy scale we are looking at on the surface of the sun is...thermal energy scale is small compare to all excitations of the atom...example, at n=1, we have two 1s state spin up and spin down. At n=2, we have...

  4. ...moon rise, the light from the moon has to travel thicker atmosphere than when it is high up at the sky. Refraction effect is more prominent and the moon looks larger. Since the moon ...

  5. ... some scientific words can be quite challenging and not easy to understand, I'll just look them up in the internet with the book beside, checking and comparing. Well...

  6. .... When we are looking at just a particular point in the space...circular B-field). Due to the influence of this induced...field will be driven to motion. Up to this point, we may conclude that a primary...

  7. ...change in potential energy that matters. If we take the certain point say r1 to be zero potential, C = GMm/r1 Then potential energy becomes: = -GMm/ r + GMm/r1 which look clumsy If we take r1----> infinity, C--->0 Then potential energy...

  8. ... through a forest. The fir trees look like arrows pointing up , and represent lines of force (ie a north pole... lines of force run, roughly, from left to right across the tube. The electrons...

  9. ... all field lines eventually end up at the moving plate. This... charges equals to the charges on the fixed...12-12 16:35:36 補充: You could look at the diagrams on the ...

  10. ...energy released in the decay is taken up by an extra particle, the neutrino. Thus during a beta...of momentum, is not violated. Try to look at the discussion in the following web-page: http...