Describe how bats and dolphins use sound waves to detect objects in the dark. The speed of sound in air is around 330 m/s. If a bat emits a single high-pitched ‘click’ of sound in a cave that is 20m wide, calculate the time taken for the echo of the sound to return to the bat.
Dolphins use seawater to transmit their high-frequency ‘clicks’. If a dolphin is 20 m away from an underwater object, deduce whether it will see the object sooner or later than the bat.
Suggest how an ultrasound scan can produce an image of an object within the human body.

label a cell membrane

label b cytoplasm

label c ribosomes

label d dna

the membrane forms the outside of the cell

cytoplasm is the liquid within

ribosomes are the components within that distribute rna

the dna is the genetic make-up

measuring physical properties lab reportinstructions: in the physical properties lab, you will test the physical properties of different building materials in order to pick the appropriate materials for a new home in tiny world. record your observations and test measurements in the lab report below. youwill submit your completed report.name and title: lyric lawton, mr.herbert, 10/13/17, physical properties lab. objective(s): i need to parvus build his house out of the right material, so he will stay cool in the mountains.hypothesis: if we use wood to build the roof of the house, then the temperature inside the house will remain cooler.if we use clay brick to build the walls and floors of the house, then the temperature inside the house will remain cooler.if we use aluminium to bring electricity into the home, then it will allow electricity to flow into the home at a faster rate.if we use iron to construct the latches on the windows and doors, then the magnetism will keep the latches secure.

plato users:

d.  

there was a variety of food available on island x, but there were only large seeds and nuts on island y.