Good night is seen as a farewell for a few reasons, but the biggest one is that you're implying that you'll be headed to bed. In the morning, you're just getting ready to start a new day, while good evening and good afternoon both imply that there is still time left in the day. Good night is used to signify the end of your day.
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The first 2 are introducing your self, when you meet a person you say hello, good morning, good afternoon, But good night indicates that you are leaving and going to bed
Volume is how loud they speak, and tone is how they sound while speaking, like how their voice represents the feeling. Like in a persuasive speech about animal abuse, Volume could be loud or soft, and the tone could be angry or sad.
