Beat Frequency Concepts and Problems

The video tutorial by Ahithi explains the concept of beats in sound waves, focusing on how two sound waves of nearly equal frequencies create beats. It introduces the formula for calculating beat frequency and provides example problems to illustrate increasing and decreasing cases of beat frequency. The tutorial concludes with tips on handling constant beat frequency scenarios.

What is a necessary condition for the formation of beats?

• Sound waves must have the same frequency.

• Sound waves must travel in opposite directions.

• Sound waves must have nearly equal frequencies and move in the same direction.

• Sound waves must have different amplitudes.

How is beat frequency defined?

• The product of the frequencies of two waves.

• The number of beats produced per second.

• The difference in amplitude of two waves.

• The sum of the frequencies of two waves.

What is the formula for calculating the time interval between two successive maxima?

• 1 / (n1 + n2)

• 1 / (2 * (n1 - n2))

• 2 / (n1 - n2)

• 1 / (n1 - n2)

In the example with tuning forks, what happens to the beat frequency when fork A is filed?

• The beat frequency decreases.

• The beat frequency increases.

• The beat frequency becomes zero.

• The beat frequency remains the same.

If the frequency of tuning fork A is 500 Hz and the beat frequency increases to 7 beats per second after filing, what is the frequency of fork B?

• 505 Hz

• 495 Hz

• 500 Hz

• 490 Hz

What should be done when the beat frequency remains the same in a problem?

• Ignore the problem.

• Assume both frequencies are equal.

• Check which frequency is decreasing.

• Check which frequency is increasing.

In the decreasing case example, what happens to the beat frequency when fork B is waxed?

• The beat frequency decreases.

• The beat frequency increases.

• The beat frequency remains the same.

• The beat frequency doubles.

What is the frequency of fork B if it is waxed and the beat frequency decreases to 4 beats per second?

• 500 Hz

• 495 Hz

• 505 Hz

• 490 Hz

What is the first step in solving a beat frequency problem using the trick?

• Write the ratio of the frequencies.

• Write the difference of the frequencies.

• Write the product of the frequencies.

• Write the sum of the frequencies.

What should be checked when solving a beat frequency problem with changing conditions?

• Which frequency is increasing or decreasing.

• Which frequency is lower.

• Which frequency is constant.

• Which frequency is higher.