A particular light source gives off light waves with a measured wavelength of 2.0 X 10-7 m. What is the frequency of the light source?

a.) 6.67 X 10-15 Hz

b.) 6.0 X 1011 Hz

c.) 1.5 X 1015 Hz

d.) Not enough information

Write down two additional questions about earth's magnetic field that will make your presentation more informative.

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?

The first-order reaction a→2b+c has rate constant 0.538 s−1. if the initial concentration of a is 0.867 mol l−1, what is the half-life of the reaction in seconds? remember to use correct significant figures in your answer (round your answer to the nearest hundredth). do not include units in your response.