A light ray ( f =5.09 × 1014 Hz) in air, incident on a boundary with fused quartz. At the boundary, part of the light is refracted and part of the light is reflected. Calculate the angle of refraction of the incident light ray. [

Galileo was the first to notice that the moon has craters, valleys, and mountains. how might this have changed people's perception of the moon at the time?

The freezing and boiling point of a substance changes as the air pressure around it changes. for example, at a lower air pressure (higher altitude) it is easier for water molecules to escape from liquid into the air. in a high altitude city such as denver, colorado compared to a sea-level city such as houston, texas, water

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