A geothermal borehole telemetry probe transmits periodic sensor data back to a recording station on the surface.
The probe can transmit signals using both infrared radiation and X-rays.
State one property of waves that is the same for infrared radiation and X-rays.
State two properties of waves that are different for infrared radiation and X-rays.
The graph below shows five pulses of the signal received from the probe.
Explain how the graph shows that the signal is not digital.
Use the graph to estimate the average time between each pulse.
Calculate the frequency of the pulses in the signal. Give the unit.
