Heat
Heat always flows...
from a warmer object to a cooler one.
How is sound made?
Objects vibrate and this makes sound.
How does light travel?
Light travels in transverse waves
A circuit where there is more than one way in which electricity can flow is called a?
Parallel circuit
you lie on the beach in summer and get burnt. This is an example of what mode of heat transfer?
Radiation
How does heat affect particles and matter?
It makes particles move quickly.
How does sound travel?
Sound travels in longitudinal waves.
What are three processors that may take place when light hits an object?
Light can be absorbed, reflected, or transmitted
3 volts
Can light travel through a vacuum?
Yes
Name one good conductor and one good insulator
metal, plastic
Through which material does sound travel the fastest?
Sound travels fastest through solid objects.
What is the difference between a translucent and opaque object?
opaque all light is reflected or absorbed. translucent some light is transmitted
What is the formula to calculate the voltage of a circuit?
V = Current x Resistance
What does the resistance of a circuit mean?
how easily electrons can flow through a particular point
When you heat water in a saucepan on a hotplate, all the water gets hot, not just the lower part near the heat source. Explain how this happens?
convection
regions of high pressure followed by regions of low pressure are called what?
compressions and refractions
What is the formula to calculate distance?
Speed X time
If the line is a straight line it means they are all proportional
increased speed of particles and more collisions
conduction
What two properties can be used to describe sound and how can they be measured on an oscilloscope?
Volume and pitch
amplitude and wavelength
If you see a flash of light from an explosion and it takes 3 seconds before you hear the noise, calculate how far away the explosion is
3s x 340m/s = 1020m
A 2.5 Ohm resistor has 5.0 Volts of voltage flowing through it. Calculate the current in the circuit?
2 Amps
Three test tubes are filled with near boiling water (97 degrees) and wrapped in three different materials. After 15 mins the tube in paper was 26 degrees, the tube in cotton wool was 36 degrees and the tube in foam was 46 degrees. Which material is the best and worst INSULATOR?
foam is best insulator
paper is worst insulator