Dual Nature of ...

A oil drop having a mass 4.8 × 10^-10 g and charge 2.4 × 10^-18 C stands still between two charged horizontal plates separated by a distance of 1 cm. If now the polarity of the plates is changed, instantaneous acceleration of the drop is (take, g =10 ms^-2)

In Millikan's oil drop experiment, an oil drop of mass 16 × 10 ^-6 kg is balanced by an electric field of 10 ⁶ Vm ^-1 . The charge in coulomb on the drop is (assume , g =10 ms^-2)

A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an electron is projected along the direction of the fields with a certain velocity, then

The figure shows the path of a positively charged particle 1 through a rectangular region of uniform electric field as shown in the figure. What is the direction of electric field and the direction of deflection of particles 2, 3 and 4 ?

If an electron moves from rest a point at which potential is 50 V to another point at which potential is 70 V, then its kinetic energy in the final state will be

If the distance of 100 W lamp is increased from a photocell, the saturation current i in the photocell varies with the distance d as

The energy of a photon is equal to the kinetic energy of a proton. If λ₁ is the de-Broglie wavelength of a proton, λ₂ the wavelength associated with the proton and if the energy of the photon is E, then (λ₁ / λ₂ ) is proportional to

In a hydrogen like atom, electron makes transition from an energy level with quantum number n to another with quantum number (n – 1). If n >> 1, the frequency of radiation emitted is proportional to

The work functions of silver and sodium are 4.6 and 2.3 eV, respectively. The ratio of the slope of the stopping potential versus frequency plot for silver to that of sodium is