Question

Assertion: A sounding object can produce 50 vibrations in 5 seconds.

Reason: The frequency of the sounding object is 10 Hz.

• A. Both Assertion (A) and Reason (R) are correct and the reason is the correct explanation of the assertion.
• B. Both Assertion (A) and Reason (R) are correct but the reason is not the correct explanation of the assertion.
• C. Assertion (A) is correct, but the reason (R) is false.
• D. Assertion (A) is false, but the reason (R) is correct.

Answer 1

The correct option is A

Both Assertion (A) and Reason (R) are correct and the reason is the correct explanation of the assertion.

Explanation for the assertion statement:

1. A sound is produced from the vibrations of a material medium.
2. Any material object can produce sound with its vibrations.
3. There is no particular limit to the number of vibrations produced by a sounding object.
4. The number of vibrations produced by a sounding object in one second is called the frequency of the sounding object.

Explanation for the reason statement:

Given:

Number of vibrations = 50

Time taken = 5 secs.

Finding frequency using the formula:

$Frequency=\frac{Numberofvibrations}{timetaken}$

By substituting the given values in the above expression, we get

$frequency=\frac{50}{5}=10Hz$

So, the frequency of the given object is 10 Hz.

Hence, the answer is (A) Both Assertion (A) and Reason (R) are correct and the reason is the correct explanation of the assertion.