Describe a simple experiment to show that sound cannot propagate through vacuum

-- Put an alarm clock or a small radio into a jar.

-- Close and seal the jar air-tight.

-- While you're listening to the clock or the radio making sound, start removing the air from the jar with some kind of vacuum machine.

-- Listen to what happens to the sound as the amount of air in the jar becomes less and less.  

wind moving at higher speeds will transfer more energy to the water, resulting in stronger waves.

b.a device that inputs heat into a cool object