An infrared wave traveling through a vacuum has a frequency of 4. 0 × 1014 Hz. What is the wave’s wavelength? 7. 5 × 107 m 7. 5 × 10–7 m 1. 2 × 1014 m 1. 2 × 10–14 m.

Of the groups of elements below, which are most likely to gain electrons to become anions? a. alkali metal b. boron group c. halogen d. transition metal

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.

Which rate indicates the number of children that would be born per woman if she were to live to the end of her child bearing years