The Sound from a Single Source Can Reach Point O

question 9

Multiple Choice

The sound from a single source can reach point O by two different paths. One path is 20.0 m long and the second path is 21.0 m long. The sound destructively interferes at point O. What is the minimum frequency of the source if the speed of sound is 340 m/s?

• A) 340 Hz
• B) 6800 Hz
• C) 520 Hz
• D) 680 Hz
• E) 170 Hz

Explain the rationale behind paired-difference experiments and their advantages.

Apply appropriate statistical methods to test hypotheses about means and variances in practical situations.

Calculate and interpret sample variances and confidence intervals for population variances.

Understand and apply the concept of degrees of freedom in the context of t-tests.