With reference to medical applications of sound, consider the following statements: 1. Echocardiography uses ultrasonic waves to form an image of the heart. 2. Ultrasonography uses X-rays to detect stones in the gall bladder. 3. Ultrasound can be used to break kidney stones into fine grains. Which of the statements given above are correct?

Correct Option The correct option is (c) 1 and 3 only. Explanation Ultrasound refers to sound waves with frequencies higher than the upper audible limit of human hearing (above 20 kHz). Due to their high frequency and ability to travel along well-defined paths, ultrasonic waves are extensively used in medical diagnostics and therapeutic procedures. Statement-wise Analysis - Statement 1 is Correct: Echocardiography is a medical imaging technique that uses ultrasonic waves to create images of the heart. The waves reflect off the various parts of the heart, allowing doctors to visualize its structure and function. - Statement 2 is Incorrect: Ultrasonography (ultrasound scanning) uses ultrasonic waves, not X-rays, to obtain images of internal organs such as the liver, gall bladder, uterus, and kidneys. The scanner transmits high-frequency sound waves into the body and converts the reflected echoes into images. X-rays involve ionizing electromagnetic radiation, whereas ultrasonography uses mechanical sound waves. - Statement 3 is Correct: High-intensity ultrasound waves are utilized in a procedure known as Lithotripsy. These waves generate shock waves that can break kidney stones into fine grains, which are subsequently flushed out of the body through urine. Key Takeaway Ultrasonography relies on the reflection of high-frequency sound waves (ultrasound) to visualize internal organs and is distinct from X-ray imaging, which uses electromagnetic radiation. Ultrasound is also capable of mechanical work, such as breaking kidney stones.

With reference to medical applications of… - NCERT Class 9 Science MCQ

NCERT Class 9 Science — Chapter 5: Sound

mcqmedium

With reference to medical applications of sound, consider the following statements:

Echocardiography uses ultrasonic waves to form an image of the heart.
Ultrasonography uses X-rays to detect stones in the gall bladder.
Ultrasound can be used to break kidney stones into fine grains.

Which of the statements given above are correct?

NCERT textbook question

From NCERT Science - class 9 · Page 10

Options

A1 and 2 only
B2 only
C1 and 3 only
D1, 2 and 3

Did you get this right?

Solution

Correct Option

The correct option is (c) 1 and 3 only.

Explanation

Ultrasound refers to sound waves with frequencies higher than the upper audible limit of human hearing (above 20 kHz). Due to their high frequency and ability to travel along well-defined paths, ultrasonic waves are extensively used in medical diagnostics and therapeutic procedures.

Statement-wise Analysis

Statement 1 is Correct: Echocardiography is a medical imaging technique that uses ultrasonic waves to create images of the heart. The waves reflect off the various parts of the heart, allowing doctors to visualize its structure and function.
Statement 2 is Incorrect: Ultrasonography (ultrasound scanning) uses ultrasonic waves, not X-rays, to obtain images of internal organs such as the liver, gall bladder, uterus, and kidneys. The scanner transmits high-frequency sound waves into the body and converts the reflected echoes into images. X-rays involve ionizing electromagnetic radiation, whereas ultrasonography uses mechanical sound waves.
Statement 3 is Correct: High-intensity ultrasound waves are utilized in a procedure known as Lithotripsy. These waves generate shock waves that can break kidney stones into fine grains, which are subsequently flushed out of the body through urine.

Key Takeaway

Ultrasonography relies on the reflection of high-frequency sound waves (ultrasound) to visualize internal organs and is distinct from X-ray imaging, which uses electromagnetic radiation. Ultrasound is also capable of mechanical work, such as breaking kidney stones.

Your note

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