Atomic and Nuclear Physics Answers

Calculate the minimum energy of a gama(γ) photon in MeV which can produce one electron-positron pair [rest mass of an electron is 9.1x10^(-31) kg].

large hydron collider is to detect what ??

define atom and write its component? how rathurford and bohr model helps us to get atomic structure?input quantum number in sequence?

A beam of C60 molecules (basically a molecule-sized ball that is 7.0 × 10^−10 m in diameter and has a mass of 1.2 × 10^−24 kg ) is directed at two small slits in a very thin metal sheet. The
molecules in the beam are travelling at 1 cm/s and the apparatus is in a vacuum. We would like to use this beam + slits to observe the wave properties of the molecules via diffraction.

a) What is the de Broglie wavelength of the molecules in the beam? (ANS: 5.5 x 10^-8 m)

b) Explain / calculate what size and spacing should be used for the slits in order to observe a
clear interference pattern on a screen 1 m away. (Hint: Depends on your assumptions.... but two slits, each 10 x 10^-6 m wide, spaced 55 x 10^-6 m apart would result in interference maxima 1 mm apart on the screen (which should be easily measurable).)

X-rays with an initial wavelength of 0.105 nm undergo Compton Scattering from an aluminium
target. Find the largest wavelength found in the scattered X-rays. (ANS: 0.110 nm)

A potassium metal photoelectric surface has a work function Φ = 2.24 eV.

a) Find the maximum kinetic energy of the electrons emitted when the surface is illuminated with light having frequency 6.00 x 1015 Hz. (ANS: 22.6 eV or 3.62 x 10-18 J)

b) Find the stopping potential for these electrons. (ANS: 22.6 V)

Estimate the orbital velocity in m/s of an electron orbiting the nucleus of a hydrogen atom at a
radius of 0.05 nm.

https://drive.google.com/file/d/0B1f-P0kkAkRVRFpITE5ka2NYTnRzcC1KWEF4Y084cGJudEZn/edit?usp=sharing

Which power is used in nuclear weapon?