An electron and a proton are detected in a cosmic ray experiment, the first with kinetic energy 10 keV, and the second with 100 keV. Which is faster, the electron or the proton? QBtain the ratio of their speeds, (electron mass = 9.11 xx10^31 kg, proton mass = 1.67 x 10-^27 kg, 1 eV = 1.60 x 10-^9 J)

What is the de Broglie wavelength associated with an electron of mas 9.11xx10^(-31)kg moving with a speed 5.4xx10^6m//s . Given h=6.63x10^(-34)Js.

A satellite orbits the earth at a height of 400 km above the surface. How much energy must be expended to rocket the satellite out of the earth’s gravitational influence? Mass of the satellite = 200 kg, mass of the earth = 6.0 xx10^24 kg, radius of the earth = 6.4 xx10^6 m, G = 6.67 x 10^-11 N m^2 kg ^-2 .

Calculate the root mean square speed of gas particles each of mass 5xx10^(-17) kg at NTP(K_B = 1.38xx10^(-23) JK^(-1)]

A proton enters a uniform magnetic field of intensity 1.5 T in a direction perpendicular to the field. If the K.E. of the proton is (8.5 x 10^-25 J) , find the force acting on it.

What is the magnitude of the gravitational force between the earth and a 1 kg object on its surface? (Mass of the earth is 6 x 10^24 kg and radius of the earth 6.4 x 10^6 m.)

An electron circulates round the nucleus in a path of radius (5.1 x 10^-11) m at a frequency of (6.8 x 10^15) Hz. Calculate the magnetic field at the centre of the path.