Which of the first four radioisotopes in the decay series has the longest half-life? Pa-234 Th-234 U-234 U-238

Joe shines white light into a bowl half full of water at an angle of incident of 27.5°. calculate the angle of refraction in the water given the indices of refraction for air and water are 1.00 and 1.36, respectively.

What does the symbol (–hfus) indicate in a phase change?

What are the advantages of using the metric system? designed as a decimal system making conversions simpler more accurate system of measurement has prefixes that correspond to an amount to use with all base units used by the entire scientific community