. What is the lowest frequency (excluding the fundamental) at which standing wave can occur in a 0.90-m long pipe with both ends open. The speed of sound in air is 343 m/s.

An initially unpolarized light if intensity 500 w/m^2 passes through four polarizers. the transmission axis between adjacent polarizers is 45∘. what percentage of the initial intensity is transmitted by the system?

The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.

Complete the statement about memory improvement. ( )involves organizing and breaking down information into easier groups to expand capacity. rehearsal is the verbal repetition of information. these techniques are especially important for the improvement of ( ) memory.