The first dental radiograph was produced using an exposure time of
A) 0.5 second.
B) 1 minute.
C) 5 minutes.
D) 25 minutes.
E) 1 hour.
D
Explanation: A) Dr. Otto Walkhoff, a German physicist, was the first to expose a prototype of a dental radiograph. This was accomplished by covering a small, glass photographic plate with black paper to protect it from light and then wrapping it in a sheath of thin rubber to prevent moisture damage during the 25 minutes that he held the film in his mouth.
B) Dr. Otto Walkhoff, a German physicist, was the first to expose a prototype of a dental radiograph. This was accomplished by covering a small, glass photographic plate with black paper to protect it from light and then wrapping it in a sheath of thin rubber to prevent moisture damage during the 25 minutes that he held the film in his mouth.
C) Dr. Otto Walkhoff, a German physicist, was the first to expose a prototype of a dental radiograph. This was accomplished by covering a small, glass photographic plate with black paper to protect it from light and then wrapping it in a sheath of thin rubber to prevent moisture damage during the 25 minutes that he held the film in his mouth.
D) Dr. Otto Walkhoff, a German physicist, was the first to expose a prototype of a dental radiograph. This was accomplished by covering a small, glass photographic plate with black paper to protect it from light and then wrapping it in a sheath of thin rubber to prevent moisture damage during the 25 minutes that he held the film in his mouth.
E) Dr. Otto Walkhoff, a German physicist, was the first to expose a prototype of a dental radiograph. This was accomplished by covering a small, glass photographic plate with black paper to protect it from light and then wrapping it in a sheath of thin rubber to prevent moisture damage during the 25 minutes that he held the film in his mouth.
You might also like to view...
A pulse oximetry reading obtained on room air is considered normal when it is:
A) 100 percent B) Greater than 97 percent C) Greater than 90 percent D) Greater than 75 percent
Hemodialysis cleanses the blood:
A) with a dialysis machine. B) using the peritoneal membrane. C) both A and B. D) neither A nor B.
Your first venipuncture request comes in at 6:30 am and happens to be in the emergency room. Once you have your request form, you proceed to look it over and verify that all information is correct. Everything on the lab requisition is correct. After properly entering the patient's room, you proceed to identify the patient. You ask the patient his first and last names and date of birth and check the wristband to verify all correct information. The patient's wristband is not on either wrist or even attached to his ankle. You cannot find the wristband. How would you proceed with this blood draw?
A. Go to the nurse's station, print out a new patient wristband, and put it on the patient. B. Take the new printed-out wristband from the nurse, attach it to the patient, and proceed with your blood draw. C. Notify the patient's nurse that you cannot draw this patient's blood until he has a proper wristband attached to him even though this patient properly identified himself. D. Obtain the blood sample due to the correct verbal patient identification.
Which of the following vitamins are associated with disorders of homocysteine?
A) Folic acid, vitamin B6, vitamin B12 B) Vitamin B3 and vitamin B2 C) Vitamin D D) Vitamin C