Which kind of waves are used in sonography?
Which kind of waves are used in sonography?
The correct option is D Ultrasonic waves
The explanation for the correct option:
Ultrasonic waves:
Sound waves of very high frequency, higher than 20 kHz are called ultrasonic waves or ultrasound. These waves are able to travel along well-defined paths even in the presence of obstacles, hence finding wide applications in industries and the medical field. Certain animals like dolphins, bats, and porpoises emit these rays to find their prey.
- In industries, odd-shaped objects like spiral tubes are placed in a cleaning solution for cleaning purposes, and ultrasonic waves are sent into the solution. The high frequency of waves results in the detachment of the particles of dust, grease, and dirt from objects.
2. Ultrasonic waves are used to find defects in huge structures like buildings, bridges, machines and also scientific equipment. If the waves are passed through the structures, they get reflected back indicating the presence of the flaw or defect.
3. Reflecting ultrasound waves from body parts because of the varying density of the tissue helps doctors to detect faults in different organs. ‘Echo-cardiography’ technique uses these waves to analyze the working of the heart. The ultrasonography technique develops images of body parts with the help of electrical signals generated from reflected ultrasonic waves.
4. Ultrasonic waves help doctors to detect abnormalities in body parts, such as stones in the gall bladder and kidney or tumors in different organs by developing an image of the part with the help of electrical signals generated from reflected ultrasonic waves.
The explanation for incorrect options:
Options A, B, and C are energy waves that have wide applications in different fields but are not suitable for sonography.
- Option A - Infra-red waves have applications in optical fibers, night-vision cameras, remote controls, infrared astronomy, etc.
- Option B - Microwaves are used in heating applications, communications, radio astronomy, remote sensing, radar, etc.
- Option C - Sound waves enable ocean exploration. Scientists use sound waves in sonar devices when they explore the oceans and also defects in metals and objects.
Hence, option (D) is correct
Ultrasonic waves
The explanation for the correct option:
Ultrasonic waves:
Sound waves of very high frequency, higher than 20 kHz are called ultrasonic waves or ultrasound. These waves are able to travel along well-defined paths even in the presence of obstacles, hence finding wide applications in industries and the medical field. Certain animals like dolphins, bats, and porpoises emit these rays to find their prey.
- In industries, odd-shaped objects like spiral tubes are placed in a cleaning solution for cleaning purposes, and ultrasonic waves are sent into the solution. The high frequency of waves results in the detachment of the particles of dust, grease, and dirt from objects.
2. Ultrasonic waves are used to find defects in huge structures like buildings, bridges, machines and also scientific equipment. If the waves are passed through the structures, they get reflected back indicating the presence of the flaw or defect.
3. Reflecting ultrasound waves from body parts because of the varying density of the tissue helps doctors to detect faults in different organs. ‘Echo-cardiography’ technique uses these waves to analyze the working of the heart. The ultrasonography technique develops images of body parts with the help of electrical signals generated from reflected ultrasonic waves.
4. Ultrasonic waves help doctors to detect abnormalities in body parts, such as stones in the gall bladder and kidney or tumors in different organs by developing an image of the part with the help of electrical signals generated from reflected ultrasonic waves.
The explanation for incorrect options:
Options A, B, and C are energy waves that have wide applications in different fields but are not suitable for sonography.
- Option A - Infra-red waves have applications in optical fibers, night-vision cameras, remote controls, infrared astronomy, etc.
- Option B - Microwaves are used in heating applications, communications, radio astronomy, remote sensing, radar, etc.
- Option C - Sound waves enable ocean exploration. Scientists use sound waves in sonar devices when they explore the oceans and also defects in metals and objects.
Hence, option (D) is correct
