answer these two question asap just tell right answer

Rquo generates a periodic wave on a taught string in a Latming Physics lab. During the experiment, Rquo notes that the Tension in the string changes in proportionality to the square of which of the following? O A. wavelength O B. frequency O C. speed of the wave O D. period O E. amplitude Two children setup a "telephone" by placing a long, slender aluminum (Y = 6.9 x 10 10 N/m 3) rod that has a length of 6.1-m between their two houses. To communicate, a child taps a coded message on one end. How long do the sound waves take to reach the other end? Note: the density of aluminum is 2700 kg/m 3. OA. 2.4 x 10 75 O B. 1.1 x 10-45 O C. 1.2 * 10-3 5 O D. 6.3 x 10-5 s O E. 8.0 x 10-65