Calculate the wavelength of emr that has a frequency of 9.50 x 10^8 hz

0.316 m

Explanation:

The wavelength of an electromagnetic radiation is given by the formula :

Speed of the electromagnetic radiation/ frequency of the electromagnetic radiation

Speed of electromagnetic radiation is given by 3*10^8 m/s

Frequency of the electromagnetic radiation is 9.50*10^8 Hz

Substituting the relevant values in the above formula:

3*10^8/9.50*10^8 = 3/9.5=0.316 m

So the required wavelength is 0.316 m

the grams   of   barium that   are in   2.3 x 10^23   atoms of barium   is   52.4 g (answer c)

    calculation

mass = moles   of ba   x molar   mass of ba

  molar mass of ba from periodic table=   137.3 g/mol

  use the   avogadro's law   constant   to   calculate the moles of barium

  that   is     1 mole =   6.02   x 10^23 atoms

                    ? moles = 2.3 x 10^23   atoms

by cross   multiplication

=(1 mole   x 2.3x 10^23 atoms)   / 6.02   x10^23 atoms)=   0.382   moles

mass   is therefore = 137.3   g/mol x 0.382 mol = 52.4 ( answer c)

explanation:

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.