If the distance between the first and tenth maxima of a double slit patterns is

Question

If the distance between the first and tenth maxima of a double slit patterns is 4.2 mm and the slits are separated by 0.15 mm with the screen 90 cm from the slits, what is the wavelength of the light used? An electron, a proton and an alpha particle, accelerated through the same potential difference, enter a region of uniform magnetic field, moving at right angles to B Compare their kinetic energies, If the radius of the proton s circular path 10 cm, what are the radii of the electron and the alpha-particle path?

Explanation / Answer

We know ß = ?D/d So, 0.0042/10 = ?*0.9/0.00015 So,? = 7*10^8 m

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