The count rate for a particular a source X is C0 on a detector placed 1 m from the source. When a metal sheet of thickness 5mm is placed between source and counter the count rate drops by 75%. What is the value of the attenuation coefficient, μ, for this radiation and metal? Select one: a. 0.12 mm-1 b. 0.277 mm-1 c. 3.01 mm d. 6.93 mm

In a CRT, electrons leave the filament as the current through the filament heats it upt.  An anode then attracts the free electrons.  According to Newton's second law of motion, the beam of electrons that emerges from the anode aperture will do this.     a.    Decelerate until they reach the fluorescent screen.     b.    Continue accelerating toward the flourescent screen.     c.     Spontaneoulsy decay into photons.     d.    Move at a constant speed toward the fluorescent screen.

A monocrystalline silicon solar panel (active area: 1m2 )has an energy conversion efficiency of 20%. What is the power output when irradiance of 800 W/m2 is shining on the solar panel? a. 320 W. b. 80 W. c. 240 W. d. 160 W. e. 400 W.

After you calibrate the SpectroVis Plus spectrometer, you must a. run a full spectrum by selecting Sensors/Calibrate/Full Spectrum. O b. change the mode by selecting Sensors/Time-Based. Oc. collect a full spectrum of the sample to determine the wavelength of maximum absorbance. O d. change the mode by selecting Sensors/Data Collection.