Question

quastion 5

Q5. A radio station transmits with wavelength of 740 m. You are listening to the radio in your car when you enter a tunnel. The depth of the tunnel below the surface of the Earth slowly increases. At what depth will you no longer be able to hear the radio? The ground has a resistivity of 100 ohm-m. Reception ceases when the signal is reduced to 0.1% of the surface value. (Hint! Penetration depth in MT survey Q6. GPR is used to study the glacier shown below. The radar system has a closely spaced transmitter and receiver system. Radar frequency is 200 MHz. A rock is located at the base of the ice at X 0 m and acts as a diffracting body. TX-RX Ice Rock (1) Calculate value of V1 (Hint! Use the relative dielectric permittivity of ice). (2) Calculate depth of bedrock, d (Hint! Use the travel time curve) V. Bedrock

Answer 1

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