Answer:
Resistivity Method
Explanation:
A disadvantage of some geophysical techniques based on magnetism is that their use in urban areas may be subject to distortion resulting from power lines and metals in the immediate vicinity. One method that can be used in such areas relies on soil moisture and the ground's resistance to electricity and is known as Resistivity.
It is usually carried out by injecting a small electrical current through the earth and measured a subtle sub-surface change in resistance over a given area.
Answer:
The largest voltage is 0.02 V.
(d) is correct option.
Explanation:
Given that,
Range = 20 dB
Smallest voltage = 200 mV
We need to calculate the largest voltage
Using formula of voltage gain
Hence, The largest voltage is 0.02 V.
Answer:
yes
Explanation:
As the formula is α= ΔL/L*ΔT where alpha (α) is the sign of coefficient of linear expansion
