GRE Physics Domain 8: Laboratory Methods Welcome to your GRE Physics Domain 8: Laboratory Methods 1. GRE Physics: Laboratory Methods When using a lock-in amplifier in a signal detection setup, what is the primary advantage of this technique? A. It increases the signal strength. B. It allows for the measurement of phase. C. It reduces noise by filtering out signals at different frequencies. D. It converts AC signals to DC. None 2. GRE Physics: Laboratory Methods In a cryogenic experiment, which material is typically used as a coolant to achieve temperatures close to absolute zero? A. Liquid nitrogen B. Liquid helium C. Dry ice D. Liquid oxygen None 3. GRE Physics: Laboratory Methods What is the main purpose of a Faraday cage in an experimental setup? A. To shield the experiment from external electric fields. B. To contain electromagnetic radiation within the cage. C. To enhance magnetic fields inside the cage. D. To isolate the experiment from thermal fluctuations. None 4. GRE Physics: Laboratory Methods In a laser cooling experiment, what is the primary mechanism for reducing the temperature of atoms? A. Adiabatic demagnetization B. Doppler cooling C. Joule-Thomson expansion D. Evaporative cooling None 5. GRE Physics: Laboratory Methods In an optical tweezers setup, what is the fundamental principle that allows for the trapping and manipulation of small particles? A. Magnetic forces B. Electric field gradients C. Gravitational forces D. Radiation pressure None 6. GRE Physics: Laboratory Methods Which technique is most suitable for measuring the surface topography of a nanomaterial? A. Transmission Electron Microscopy (TEM) B. Atomic Force Microscopy (AFM) C. X-ray Diffraction (XR D. D) Ultraviolet-visible spectroscopy (UV-Vis) None 7. GRE Physics: Laboratory Methods In a Hall effect measurement setup, what property of a material is directly measured? A. Electrical resistivity B. Thermal conductivity C. Carrier density D. Magnetic susceptibility None 8. GRE Physics: Laboratory Methods What is the primary reason for using a cryostat in low-temperature physics experiments? A. To maintain a vacuum B. To provide thermal insulation C. To measure electrical resistance D. To apply a magnetic field None 9. GRE Physics: Laboratory Methods In a time-of-flight (TOF) mass spectrometry experiment, what physical quantity is measured to determine the mass of ions? A. Velocity B. Time C. Electric charge D. Magnetic field strength None 10. GRE Physics: Laboratory Methods In a Fourier-transform infrared (FTIR) spectroscopy experiment, what is the key advantage of this technique compared to dispersive IR spectroscopy? A. Higher resolution B. Faster data acquisition C. Better signal-to-noise ratio D. All of the above None 1 out of 10 Time is Up! Time's up
