Flashcards

P1 topic 4 edexcel

Princess Terin Core Science Higher Inglês 10 flashcards

Flashcards do conjunto (10)

1Define infrasoundSound with lower frequencies than 20Hz.
2Define ultrasoundSound with a frequency greater than 20000Hz
3Give four uses of infrasoundCommunication between animals,
detects animal movement in remote areas,
detection of volcanic eruptions and meteors.
4Give three uses of ultrasoundSonar,
communication between animals,
foetal scanning.
5A ship detects a sonar pulse 3 seconds after it was emitted. The speed of sound in water is 1500m/s. Calculate the depth of the water and the distance the wave has travelled.Answers:
depth - 2250m
distance travelled - 4500m
6What two events cause seismic waves?Earthquakes and explosions
7Seismic waves can be S or P waves. What type of wave are each of these?S – transverse,
P – longitudinal.
8What two things can happen to a seismic wave at boundaries between the crust, mantle or core?Reflected or refracted.
9What is the outermost layer of the earth composed of and what do these do?Tectonic plates, move due to convection currents in the mantle.
10What natural event can happen at a plate boundary and what is released?Plates sliding past each other releasing energy