PAEMRRS-1

Thermal remote sensing primarily detects differences in:

• Surface reflectivity

• Surface temperature

• Atmospheric pressure

• Vegetation health

What is the fundamental difference in how optical and thermal sensors acquire data?

• Optical sensors emit their own energy, while thermal sensors rely on reflected energy.

• Optical sensors detect emitted energy, while thermal sensors rely on reflected energy.

• Optical sensors primarily detect reflected or emitted solar radiation, while thermal sensors detect emitted thermal infrared radiation.

• Optical sensors operate only during the day, while thermal sensors operate only at night.

Clouds are generally more opaque in which part of the spectrum?

• Microwave

• Ultraviolet

• Visible and near-infrarred

• Radio waves

Polarization in remote sensing refers to the:

• Wavelength of the electromagnetic radiation.

• Direction of the electric field oscillation of the electromagnetic radiation.

• Intensity of the electromagnetic radiation.

• Frequency of the electromagnetic radiation.

What is the primary advantage of using different polarizations in remote sensing?

• Enhanced information about the scattering characteristics of the target

• Ability to penetrate clouds

• Improved spatial resolution

• Reduced atmospheric interference

The amplitude of a seismic reflection is primarily influenced by the:

• Distance between the source and receiver

• Frequency content of the seismic source.

• Velocity of the seismic wave.

• Density contrast across the reflecting interface.

A change in acoustic impedance at an interface will cause:

• Refraction of the seismic wave only.

• Diffraction of the seismic wave only.

• Both reflection and refraction of the seismic wave.

• No change in the seismic wave.

What does a strong amplitude reflection typically indicate?

• A sharp and significant change in subsurface properties.

• A gradual change in subsurface properties.

• A deep geological structure.

• A shallow, low-density layer.

The Doppler Effect in remote sensing refers to the change in the observed frequency of electromagnetic radiation due to:

• Changes in the sensor's altitude.

• Variations in atmospheric density.

• The polarization of the emitted radiation

• Relative motion between the sensor and the target.

In the context of radar, a target moving towards the sensor will cause the received frequency to:

• Increase

• Decrease

• Remain the same

• Become polarized