Which of the following is the change in energy of an atom emitting a photon of wavelength of 4.35 meters? [planck's constant, h = 6.626 × 10-34 js, c = 2.998 × 108 meters/second] a)1.986 × 10-25 joules b) 2.823 × 10-34 joules c)9.614 × 10-42 joules d)4.567 × 10-26 joules

Achef makes salad dressing by mixing oil, vinegar, and spices, as shown. which type of matter is the salad dressing?

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.

What is the area in square meters of 448 g ai foil that has a thickness of 23921 nm? the density is 2.70 g/cm