The security scanning machine at the airport produces X-Ray of wavelength 4x10^-10m. What is it’s frequency? (Answer is 7.5x10^17Hz, I just need the working)

Achemistry student needs of 40ml diethylamine for an experiment. by consulting the crc handbook of chemistry and physics, the student discovers that the density of diethylamine is 0.7 . calculate the mass of diethylamine the student should weigh out. round your answer to significant digits.

Which of the following are considered noble gases? a. bromine b. neon c. argon d. chlorine

The speed of light can be used to measure the