The energy in monochromatic X-rays of wavelength 1 Å is roughly equal to
Obtain the de-Broglie wavelength associated with thermal neutrons at room temperature (27o C). hence explain why a fast neutron beam needs to be thermalised with the environment before it can be used for neutron diffraction experiments. The mass of neutron is and the Boltzmann constant .
Calculate the de-Broglie wavelength of an electronic energy 100 eV.
An electron microscope uses electrons accelerated through 50 kV. Find the de-Broglie wavelength of these electrons. If other factors like numerical aperture etc. are roughly the same, how does the resolving power of an electron microscope compare with that of an optical microscope which uses variable light?
The force exerted by a magnetic field on a charged particle is independent of the
The monoenergetic electron beam electron speed of is subjected to a magnetic field of normal to the beam velocity. What is the radius of the circular path traced by the beam? Given e/m forelectron .
Two parallel plates are placed 5 cm apart in an evacuated tube and a potential difference of 200 V is applied across them? What is the force experienced by an electron at rest in the region between the plates?
The first scientist to measure the charge to mass ratio of the electron was
In Thomson’s experiment for determining , the potential difference between the cathode and the anode (in the accelerating column) is the same as that between the deflecting plates (in the region of crossed fields). If the potential difference is doubled, by what factor should the magnetic field be increased to ensure that the electron beam remains undeflected?
The minimum wavelength of X-rays emitted from an X-ray tube operating at a voltage of 104 volts is roughly equal to
What is the unit of Planck’s constant?