Nuclei — Physics STD 12 Science — Question

6 A particle of charge q and mass m moves rectilinearly under the action of electric field E = A – Bx, where A and B are positive constants and x is distance from the point where particle was initially at rest then the distance travelled by the particle before coming to rest and acceleration of particle at that moment are respectively:

Who discovered the first spectral series?

According to Bohr’s theory of H atom, an electron can revolve around a proton indefinitely, if its path is:

Which of the following are conductors.

If an element X has mass number and number of proton 8 then identify element X :

Beta particle An unknown particle is being studied in a magnetic field of variable intensity and direction. When the magnetic field is turned off, the particle is observed to move toward the earth. When the magnetic field is turned on, the particle is observed to continue to move toward the earth, no matter the strength or the direction of the magnetic field. Which of the particles listed below is most likely the unknown particle?

If a spherical conductor comes out from the closed surface of the sphere then total flux emitted from the surface will be