____ is the ability to do work ____ is the source where it makes things visible Examples of natural sources include: Aurora, Stars, ____, Moon, Fireflies Some organisms that naturally give off light are called ____ Examples of artificial sources include: Electric lights, gas lamps, oils, ____ How many ways can light travel? Answer: ____ Absorption, reflection and ____ is how light travels All light passes through ____ objects Partial light passes through ____ objects All light gets blocked through ____ objects A dark patch of blocked light behind an object is called a ____ ____ plays a vital role in our daily lives. Sound is made through ____ When an object vibrates, it causes the medium around it to also vibrate. The medium is also called the ____ Pleasant sounds are ____ to hear. Unpleasant sounds are ____ to hear Some sounds are useful to man. Is this sound useful: barking of dogsAnswer: ____ ____ is the measure of the sound. A human ear can hear sounds from ____. Reflected sounds are called ____ To make an echo, why is it necessary to avoid soft furniture?Answer: ____ Temperature rises as this is a form of ____ energy The most natural and important source of the heat is ____ Rubbing two objects against each other to make heat is called ____. The transfer of heat from molecule to molecule is called ____. The movement of heated matter to transfer one part to another is called ____. ____ is the process wherein heat is transferred from a light source though there is no medium.

Light, Heat and Sound

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