How to send email to multiple recipients on creation of new node using rules module?
To send emails to multiple persons on creating a new node, you have to create a new rule and follow these steps :

Create an event After saving a new content type and then select that particular content type.

After that add an action from Select the action to add select list and choose Send Email.

After that you can add multiple email ids in the To textarea separated by comma and space like this :
first_email@mail.com, second@mail.com, third@mail.com