A balloon blown up with air hanging in a room. as the air in the room becomes colder the balloon becomes smaller because the molecules of air​

Iwas going to ask that quesytion  sorry dude i dont  know : (    : /

The waves slow downn

Jenny and fred both play a long note on their trombones. a stationary observer hears the sound increasing and decreasing repeatedly in loudness. which of these must be true? the sound waves from the two trombones have slightly different frequencies.the sound waves from the two trombones have the same frequency.the sound waves from the two trombones have slightly different amplitudes.the sound waves from the two trombones have the same wavelength.the sound waves from the two trombones have slightly different velocities.  lolthe answer is          the sound waves from the two trombones have slightly different frequencies.

Answerok the answer is (all)