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Which frequency below is not classified as ultrasonic?

The normal frequencies of sound that the human ear can hear is …

Which statement below is true about the frequency and period of a mechanical wave?

Sound travels through the human body at 1,540 m/sec.  Compute the wavelength of a sound wave traveling through a patient receiving an ultrasound scan if the frequency of the scan is 7.5 MHz.  Careful with the units on this problem.   Give your final answer in millimeters.  (1 m = 1000 mm)

Directions: Complete the conditional sentence with the best completion.    Clara didn’t know about the party, so she didn’t attend it. If Clara __________ about the party, she would have attended it.

Directions:  Select the best answer (gerund or infinitive) to complete the sentence below.    Our teacher apologized for ________ our class last week. But my classmates and I told her not to worry because we all went out to lunch together and had a great time!

Directions:  Combine the two sentences below into one sentence using an adjective clause.  The professor is very dedicated. The professor stays late to help students with their studies.   

Directions: Combine these two sentences into one sentence using an Adjective Clause.   The Seascape Hotel has a beautiful view of the ocean. We stayed at the Seascape Hotel on our last vacation.

Directions:  Select the best answer (gerund or infinitive) to complete the sentence below.    Armin is really good at ________ things around the house. He can repair almost anything as long as he has the right tools. 

Directions:  Finish the sentence with an appropriate noun clause.  It’s sad to me that  _____________________________ .