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Bragg's law (Sir W.L. Bragg; 1912)
While a beam of x-rays strikes at crystal surface wherein the layers of atoms or ions are separated regularly, the maximum intensity of the reflected ray takes place while the complement of the angle of incidence, theta, the wavelength of x-rays, lambda, and the distance among layers of atoms or ions, d, are associated by the equation
2 d sin theta = n lambda,
Where n is an integer.
Two vibrating particles that are "out of phase" differ in the phase of their vibration by: a) 1/4 cycle b) 1/2 cycle c) 3/4 cycle d) 1 cycle Ans: Two vibra
The voltage drops across two components when connected in series across an a.c. supply are v1 =150sin 314.2t and v2 =90sin(314.2t -∏/5) volts respectively. Determine (a) the v
Put a nail in the lower end of a candle. The nail should be just the right weight to make the candle float with its top a little above the surface of the water. Float the candle an
Two resistors are connected in series across an 18V supply and a current of 5A ?ows. If one of the resistors has a value of 2.4Ω determine (a) the value of the other resist
The molecular theory of magnetism was given by Weber and modified later by Ewing. According to that theory - Each molecule of a substance is a complete magnet in itself. Though,
The radioactive isotope D decays according to the sequence If the mass number and atomic number of D2 are 176 and 71 respectively, what is (i) the mass number (ii) atomic
A board with a number of green, blue and red coloured switches is normally seen near the entrance of each house . What is the purpose of this board? What is the difference a
What is the effect of torque and equilibrium on taps,handlebars and bicycles?
The proton and neutron are collectively called as: (1) Deutron (2) Positron (3) Meson (4) Nucleon Ans: (4) Nucleon
What is the relationship among the period and the square root of the length? The graph is linear, so the period is proportional to the square root of the length of the string.
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