Sem 2 L Pretest: Unit 4
WA
Question 3 of 30
What is the frequency of an electromagnetic wave that has a wavelength of
3.7 x 10-11 m in a vacuum? (The speed of light in a vacuum is 3.00 x 108
m/s.)
O A. 1.2 x 10-19 Hz
OB. 8.1 x 1018 Hz
O C. 2.7 x 1010 Hz
O D. 1.1 x 102 Hz
SUBMI

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.

a) the particles of the chair are strongly held together.

it forms an anion that has a larger radius. anions have a negative charge and are larger than the original atom.