If the attenuation coefficient of an ultrasound beam is 1dB cm-1 MHz-1, the attenuation of an ultrasound at 2 MHz passing through a 1.5 cm thick tissue is

When an ultrasound beam is focused tighter, the depth of focus becomes larger.

An ultrasonic beam propagates from medium 1 into medium 2. If the incident angle is smaller than the refraction angle, the sound velocity in medium 1 is higher than that in medium 2.

The thinner the piezoelectric crystal, the higher the resonant frequency that may be created.

The main reason of using ultrasound gel between a scanner and the skin is to allow the scanner to move smoothly on the skin.

A 28-year-old client presents to the clinic with complaints of fever, muscle aches, sore throat, and swollen lymph nodes. The client reports unprotected sexual intercourse with a new partner approximately two weeks ago.  HIV testing is ordered, and the client’s CD4+ T-cell count is 720 cells/mm³.  Based on these findings, which stage of HIV infection is the client most likely experiencing?

If adults of legal drinking age choose to consume alcohol, the Dietary Guidelines for Americans recommend drinking in moderation, which is defined as

Which of the following is a potent stimulator of milk production for a lactating woman?

​The infant should be allowed to drain one breast before offering the other breast primarily to

A ______ is a medicine or herbal substance that may increase milk supply in breastfeeding mothers.