Final answer:
The objective of an author giving a lecture can be to inform, entertain, or persuade the audience. By analyzing the content, form, and intent of the speech, one can discern the underlying purpose; however, without specific information about the lecture, it is difficult to conclusively determine the author's objective.
Step-by-step explanation:
The author's objective in giving a lecture can be discerned by analyzing the content and purpose of the speech. Informative speeches typically aim to educate the audience on a subject, providing clear and comprehensible information. This type of speech might explain how something works, like a thermostat, or describe an event or person in detail. Examples of entertaining speeches include humor-filled presentations that aim to amuse the audience with anecdotes, jokes, or witty observations. On the other hand, persuasive speeches are designed to influence the beliefs or behaviors of the audience, encouraging them to adopt a new standpoint or take specific action. An example of a combined informative and persuasive speech is President Franklin D. Roosevelt's Pearl Harbor address, which not only informed the audience about the attack but also sought to persuade Congress to declare war on Japan.
When attempting to determine the author's objective, one should consider whether the speech provides factual information, uses humor, or is making an argument meant to persuade. The delivery and organization of the speech, use of media or humor, and emotional cues can also indicate the author's intent. Without specific information about the lecture in question, it's challenging to conclusively determine the author's objective.