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Suppose that the x rays are emitted from a focal spot isotropically. The photon flux is 3.28 x 106 photons mm-2 sec-1 at a distance of 0.75 m from the focal spot. What is the photon flux at a distance of 10 cm from the focal spot? Neglect the effects of air attenuation.
Derive a mathematical expression for the energy stored in a capacitor. What is the energy stored when the space between the plates is filled with a dielectric a) With chargi
Portrayed is a ray from an object which heads toward and then into a lens. Suppose if the ray is a principal ray where does it go from there? Ans: This is the simple p
It is the molecular weight of a substance expressed in grams ; the basic unit of amount of substance adopted under the Systeme International d''Unites.
Basic concepts of electromagnetic spectrum: BASIC CONCEPTS 1. When Sun light falls on a prism, the transmitted light produces a sequence of colours called 'Spectrum'. 2
Megavoltage therapy: Kerst developed the betatron which accelerates electrons to high energy .It open a new radiation therapy era-the supervoltage or megavoltage era.Another
Occam's [or Ockham's] razor (William of Occam [or Ockham]; c. 1340): The recommendation that the simpler a theory is, the better. If two of the theories predict phenomena to t
Concept: You are moving into an apartment and take the elevator to the 6th floor. Does the force exerted on you by the elevator do positive or negative work when the elevator (a)go
GYROSCOPES: PRINCIPLES Gyroscopes are rotating masses (usually cylindrical in form) which are deliberately employed because of the particular properties which they demonst
Draw a picture of a moving source and the waves surrounding it according to what you observed in this experiment. How does the spacing of the wavefronts in front of the source comp
What is the difference among isolation transformers and step up or step down transformer? Actually an isolation transformer may be physically the similar as a Step up/Step Down
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