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I want you to help me in resolving these questions First question When Down stone in the basin of water eroded the bandwidth with dimension The Center fell in stone. What explanation The second question Sound waves move from air to water. Discussed the impact on The frequency and...

I want you to help me in resolving these questions First question When Down stone in the basin of water eroded the bandwidth with dimension The Center fell in stone. What explanation The second question Sound waves move from air to water. Discussed the impact on The frequency and...

I want to help me in a study that article Whether you anything regarding the substance and light beams, please help me

I want to ask you about exams series article wave and light That helped me And if there were questions, please give me the explanatory thanks