How many uranium atoms are there in 9.2 g of pure uranium? The mass of one uranium atom is 4 × 10−26 kg.
These are basically free points if you can give me an explanation.

Describe the path of a ray that approaches a mirror parallel to the principal axis.

While standing outdoors one evening, you are exposed to the following four types of electromagnetic radiation: yellow light from a sodium street lamp, radio waves from an am radio station, radio waves from an fm radio station, and microwaves from an antenna of a communications system. rank these type of waves in terms of increasing photon energy.

What does the law of conservation of mass state?