Recently Active Optics Questions

an accelerated electron strikes a target in a x ray tube with kinetic energy K. energy lost in the forst collision yields a photon of wavelength λ. if 50% of the remaining energy is lost in next collision , find the waveleng ...

which wont give dispersion??????? plz give proper reason also...... *Image* ...

A nucleus with mass no. 220 initially at rest emits an alpha particle.If Q value of reaction =5.5MeV ,then calculate KE of alpha particle ...

In case of a ray travelling frm MEdium a to medium b WaT IS THE NECESSARY COndition/relationg between the refractive indices of a and b SO AS TO BRING ABT A PHASE CHAGE OF Î in the traveling wave.....?????????? ...

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how to find the total no of fringes in an interference pattern in YDS ...

High quality lenses are often coated to prevent reflection. A lens has an optical index of refraction of 1.72 and a coating with an optical index of recraction 1.31. For near normal incidence the minimum thickness of the coat ...

i read this statement today.......... for no dispersion d(1/f)=0 can anyone explain it plz.... ...

Can sum1 pl. explain me Question 2 n 3 *Image* ...

IIT - Physics Half - life of a radioactive subst. A is 4 days. The probability that a nucleus will decay in 2 half-lives?? ...

a convex lens of focal length 25cms was cut along the diameter into two identical halves and then was again set leaving a thin gap of width a= 0.1cm as shown. A narrow slit emtting monochromatic light of λ = 0.6μm was place ...

for a certain metal the K absorption edge is at 0.172 x 10-10m please explain what does this mean also we are given Ka wavelength How to calculate EK i.e. energy of K orbit ...

photons emmited during transitions between corresponding pairs of levels in He+ and H have the same energy E and same wavelength = hc ------ E tell whether this statement is correct or not If correct , why ...

please check the ques related to fusion and fission they have given ans as (b) & (d) won't it be (b) &(c) please correct me ...

two thin parallel slits are made in an opaque sheet of film when a monochromatic beam of light is shone through them at normal incidence , the first bright fringes in the transmitted light occur at 45° (both sides of central ...

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a beam of light has a small wavelength spread δλ about a central wavelength λ.the beam travels in vaccum until it enters a glass plate at an angle θ relative to the normal to the plate .the index of refraction of glass is ...

PRETTY EASY ONE...... BUT I HAV MY DOUBTS WID DA ANSWERS GIVEN........... *Image* PL. POST UR ANSWERS............ Answers as given in da papaer are : [DCB] ...

An engineer wants to locate a water pipe buried about half a meter below the surface of the field. Of the following , which sort of radioactive isotope(emitter) , he shall add to the water? a) γ emitter of T1/2 of several da ...

1)why is luminous efficiency small for a filament bulb as compared to a mercury varour lamp? 2)the yellow colour has greater luminous efficieny as compared to the other colours Can we increase the illuminating power of a ...

when light travels from one medium to other its speed changes but whether its colour changes or not i.e. whether colour is determined by frequency of wave or its wavelenght secondly we have done in dopplers effect that since ...

a wave travels uniformly in all directions frm a pt source in an isotropic medium .the displacement of the medium at any pt at a distance r frm d source may be represented as(a isa constant representing strength of source ) ( ...

a closd orga n pipe of radius r1 and an open organ pipe of radius r2 and having same length L resonate when excited with a tuning fork .closed organ pipe resonates in its fundamental mode an open in first overtone then (a)r2- ...

if l1 n l2 are the length of the air columns for the first n second resonance when a tuning fork of frequency n is sounded on a resonance tube then the distance of displacemnt antinode frm the top end of resonance tube (a)2(l ...

in a test of subsonic jet flies qver head at an altitude of 100 m the sound intensity on the ground as the jet passes overhead is 160 db .At wha let altitude shud d plane fly so that noise isss than 120 db ans 10 km plz expla ...

a sufficiently long organ pipe has a small hole at the bottom.initially the pipe is empty .water is poured into the pipe at the constant rate .the fundamental frequency of air column in d pipe (a)cont increase (b)first increa ...

In a Young’s double slit experiment, the separation between the two slits is d and the wavelength of the light is λ. The intensity of light falling on slit 1 is four times the intensity of light falling on slit 2. Choose t ...

*Image* a ray incident at an angle 53° on a prism emerges at an angle of 37° as shown .if the angle of incidence is made 50° then value of angle of emergence a 35 b 42 c 40 d 38 ...

a certain mirror placed at the origin has i^ as the normal vector to its reflecting surface. the mirror begins to translate with a velocity i^ +j^ +k^ at t=0, at the same time an object which was initially at i^+j^ starts mov ...

a light of wavelength λ is incident on a metal sheet of work function 2ev. The wavelength I varies with time as I=3000+40t., where I is in A and t is in sec.The power incident on the metal surface is 100W. the signal is swit ...