Two of the three tuning forks have known frequencies. when a 510 hz. fork and the unknown fork are struck together, four beats per second are heard. when a 505 hz. fork is struck with the unknown fork, beats are produced that are too numerous to count accurately. what is the frequency of the unknown fork?

Which of the following elements is in the same period as phosphorus? a. carbon c. nitrogen b. magnesium d. oxygen select the best answer from the choices provided a b c d

This is the substance(s) formed in a chemical reaction.

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.