Grade 12th pass10 grade science
The resistivity of copper at room temperature is 1.7×10−8Ω−m. If the density of the mobile electrons is 8.4×1028m−3, the relaxation time for the free electrons in copper is (mass of electron 9×10−11kg and charge of electron 1.6×10−19C)
A. 2.5×10−14s
B. 2.5×10−12s
C. 2.5×10−10s
D. 2.5×10−8s
The resistivity of copper at room temperature is 1.7×10−8Ω−m. If the density of the mobile electrons is 8.4×1028m−3, the relaxation time for the free electrons in copper is (mass of electron 9×10−11kg and charge of electron 1.6×10−19C)
A. 2.5×10−14s
B. 2.5×10−12s
C. 2.5×10−10s
D. 2.5×10−8s
