Question 10
Ultrasound has frequency of vibration

(a) Between 20 and 20,000 Hz
(b) Below 20 Hz
(c) Above 20,000 Hz
(d) Between 500 and 10,000 Hz

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Solution

The answer is (c).
Frequency above 20000 Hz is ultrasound.

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Q. Question 10
Ultrasound has frequency of vibration

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(b) Below 20 Hz
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(d) Between 500 and 10,000 Hz

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Question 82(iv)

Given below is a frequency distribution table. Read it and answer the questions that follow.
$\begin{matrix} C l a s s i n t e r v a l & F r e q u e n c y 10 - 20 & 5 20 - 30 & 10 30 - 40 & 4 40 - 50 & 15 50 - 60 & 12 \end{matrix}$
Which interval has a frequency of 10 ?

Question 82(iv)

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Question 10 Ultrasound has frequency of vibration (a) Between 20 and 20,000 Hz (b) Below 20 Hz (c) Above 20,000 Hz (d) Between 500 and 10,000 Hz

The answer is (c). Frequency above 20000 Hz is ultrasound.

Question 10
Ultrasound has frequency of vibration

(a) Between 20 and 20,000 Hz
(b) Below 20 Hz
(c) Above 20,000 Hz
(d) Between 500 and 10,000 Hz

The answer is (c).
Frequency above 20000 Hz is ultrasound.