This question is about ultraviolet (UV) radiation.
It took humans a long time to discover ultraviolet radiation. Suggest two reasons why.
Look at the information about some ultraviolet radiation:
- The wavelength of the UV radiation is 240 nm240\text{ nm}240 nm.
- The wave speed of the UV radiation is 3.0×108 m/s3.0 \times 10^8\text{ m/s}3.0×108 m/s.
Calculate the frequency of the UV radiation. Use the equation: wave speed=frequency×wavelength\text{wave speed} = \text{frequency} \times \text{wavelength}wave speed=frequency×wavelength Give your answer to 2 significant figures.
The atmosphere contains an ozone layer. This graph shows how the percentage of ultraviolet (UV) radiation absorbed by ozone depends on wavelength:
Describe the difference in the transmission of UV radiation at 280 nm280\text{ nm}280 nm and 300 nm300\text{ nm}300 nm. Use data from the graph in your answer.
Why is the ozone layer important for life on Earth? Use the details about UV radiation to help explain your answer.