What is photo-electric emission

When light falls upon certain metals, they emit electrons. these emitted electrons are called photo-electrons and the process of emitting these electrons is known as photo-electric emission. the enrgy within the light helps the elctrons of the metal to gain more energy and then get emitted from the surface of the metal. The light falling on the surface of the metal gets absorbed and helps in the release of the electrons.Most of the Alkali metals are highly sensitive to light energy and it readily discharges electron by this method.

Divide 108.2 x 10^6 into 1.5 x 10 and the result will be in au (astronomical units)

Answer: a charge of -1.0  × 10⁻⁴ c must be placed  at x = 26 m.the sign of the charge will be the same sign as the  -4.0  µc charge.======electricstatic force between two point charges  is given by    where k is coulomb's constant,  8.99×10⁹  n·m²/c², q₁ and q₂ are the point charges, and r is the distance between the two point charges.assign positive to q₁let q₁ =  6.0 µc, q₂ = -4.0  µc, q₀ represent the charge at the origin, and q₃ represent this new charge to place.the charge at the origin q₀ would experience the following force f₀₁ from q₁, with r = 6.0 m (note that 1  µc = 10⁻⁶ c)    the force from q₂    the force from q₃    the net force on the origin charge, q₀, has to be zero for no electrostatic forcehaving an equation where k and q₀ can be divided out of the equation will allow us to solve for q₃    isolating:     a charge of -1.0  × 10⁻⁴ c must be placed  at x = 26 m.the sign of the charge will be the same as the  -4.0  µc charge