Question

Ge and Ag are cooled to a temperature of 305 K. then how it affect their resistivity ​

Answer 1

As the temperature increases the vibrations of the metal ions within the lattice structure increases.

Explanation:

• The resistivity of materials depend upon the temperature.
• The equation that shows the relation between temperature and resistivity is ρt = ρ0 [1 + α (T – T0), within the equation ρ0 is that the resistivity at a typical temperature, ρt is that the resistivity at t0 C, T0 is that the reference temperature and α is that the temperature co – efficient of resistivity.
• As the temperature increases the vibrations of the metal ions within the lattice structure increases.
• The atoms starts to vibrate with higher amplitude.
• These vibrations successively causes frequent collisions between the free electrons and therefore the other electrons.
• Each collision drain out some energy of the free electrons and causing them unable to maneuver .
• Therefore it goes on to restrict the movement of the delocalized electrons. When the collision happens the drift velocity of the electrons decreases. this suggests that the resistivity of the metal increases and thus current flow within the metal is decreased.
• The resistivity increases means the conductivity of the fabric decreases.

Answer 2

Answer:

Ge and Ag are cooled to a temperature of 305 K. then how it affect their resistivity ​for Ge increases and for Ag decreases.

in the given question Ge is semiconducting material while Ag is a metal. we know the property of resistivity for metal resistance increases with an increase in temperature.  

and the semiconductor has a negative temperature coefficient of resistance. hence when the temperature decreases and becomes cool its resistance increases.