Two electrons are moving towards each other with a velocity of `10^6m/s`. What will be the closest distance of approach between them?

A charged particle q is thrown with a velocity v towards another charged particle Q at rest. It approaches Q up to a closest distance r and then returns. If q is thrown with a velocity 2v, what should be the closest distance of approach?

The image of an object at a distance of 40 cm from a convex mirror is formed at a distance of 10 cm from the mirror . If the object begins to move towards the mirror with a velocity of 8 cm * s^(-1) what will be the velocity of the image?

Determine the de Broglie wavelength of an electron moving with velocity 10^(6) m.s^(-1) . What will be the de Broglie wavelength of a proton, moving with the same velocity? Given, Planck's constant = 6.62xx10^(-34) J.s , mass of electron = 9.1xx10^(-31) kg , mass of proton is 1840 times that of an electron.

Charge of an electron is e and mass m. The electron is moving around a nucleus of charge Ze in a cirular path of radius r. What will be the velocity of the electron ?

Two particles of equal mass moving towards each other with velocities 20 m*s^(-1) and 30 m*s^(-1) collide. If the collision is elastic, find their velocities after the collision.

Two insulated metal spheres of the same size are charged with -15 esu and +25 esu. The distance between their centres is 10 cm. What is the force acting between the two charges? If the two spheres are made to touch each other and then placed in their previous positions, what will be the force acting between them?

A proton is fired with a velocity 7.45 xx 10^(5) m//s towards another free proton at rest. Calculate the minimum distance of approach between the protons. The mass of a proton = 1.66 xx 10^(-22) kg .

When ultraviolet rays of wavelength 620 Å is incident on a hydrogen atom in the ground state, its electron is emitted with a velocity of 1.5 xx10^(6) m *s^(-1) . What is the ionisation energy of hydrogen ? Given , h= 6.625xx10^(-34)J *s , mass of electron = 9.1 xx 10^(-31)kg, c=3xx 10^(8)m*s^(-1) and 1 eV=1.6xx 10^(-19)J .

An electron is moving northwards with a velocity 10^(7)m/s in a magnetic field of 3 T directed eastwards. Calculate the instantaneous force on the electron.