A laboratory is suspected to be contaminated with radiation from a radioactive material. Which of the following detection instruments can be best used to detect this radiation? An X-ray film, because it can detect the low frequency X-rays.
An X-ray film, because it can detect the low energy infrared radiation.
A Geiger counter, because it can detect the high energy gamma rays.
A Geiger counter, because it can detect the highly penetrating ultraviolet radiation.

What is the force of attraction between the particles in a salt crystal

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.

How are the terms group and period used on the periodic table