What type of sound wavelength creates images with improved resolution?

How wide is the typical focal point of a sound beam?  

The imaging depth during an ultrasound exam is set at 10 cm.  The sonographer adjusts the imaging depth to 4 cm.  What other parameters are affected when the sonographer makes this change? (Choose all that apply) 

The imaging depth during an ultrasound exam is set at 2 cm.  The sonographer adjusts the imaging depth to 8 cm.  What happens to the pulse repetition frequency?

If 1 Amp of current passes through the body, would you consider this a dangerous level of current?

What is the allowed leakage current of permanently wired equipment 

If a single fault condition occurs in an isolated power system, what happens?

Why is the ground resistance measurement performed first?

According to ISO 60601, leakage tests only need to be performed under normal polarity

What is the max amount of current a person can receive and still be able to release themselves from the device they are being shocked by