Consider the following statements :(A) Cu-Fe thermocouple produces more thermo emf than Bi-Sb couple.
(B) Thermoelectric effect is used to measure heat radiation.
(B) Thermoelectric effect is used to measure heat radiation.
The correct option is B A is false B is true
Thermoelectric Series: Sb, Fe, Cd, Zn, Ag, Au, Cr, Sn, Pb, Hg, Mn, Cu, Pt, Co, Ni, Bi
Thermoelectric emf produced is directly proportional to the distance between the two metals. Farther metals provide the maximum emf.
When two metals in a thermoelectric series form a thermocouple, there is a flow of current from the cold junction from the metal appearing on the top to the metal appearing at the bottom of the series. And we see that for a given temperature difference farther metals can produce a larger emf. For example Sb-Bi (Antimony-Bismuth) shows a larger e.m.f for a given temperature difference. In the case of Cu-Fe thermocouple, the emf is lesser.
hence statement A is false.
Thermoelectric effect is used to measure heat radiation. The temperature of an object is found by detecting the infrared radiation(IR) emitted by the object. A thermopile is device with large number of thermocouple connected in series.A thermocouple such as Bismuth-Antimony thermocouple can be used to measure the intensity of heat radiations.
hence Statement B is true.
Thermoelectric Series: Sb, Fe, Cd, Zn, Ag, Au, Cr, Sn, Pb, Hg, Mn, Cu, Pt, Co, Ni, Bi
Thermoelectric emf produced is directly proportional to the distance between the two metals. Farther metals provide the maximum emf.
When two metals in a thermoelectric series form a thermocouple, there is a flow of current from the cold junction from the metal appearing on the top to the metal appearing at the bottom of the series. And we see that for a given temperature difference farther metals can produce a larger emf. For example Sb-Bi (Antimony-Bismuth) shows a larger e.m.f for a given temperature difference. In the case of Cu-Fe thermocouple, the emf is lesser.
hence statement A is false.
Thermoelectric effect is used to measure heat radiation. The temperature of an object is found by detecting the infrared radiation(IR) emitted by the object. A thermopile is device with large number of thermocouple connected in series.A thermocouple such as Bismuth-Antimony thermocouple can be used to measure the intensity of heat radiations.
hence Statement B is true.
