Physics Final Exam

Physics Final Exam Study

Some text here about the topic of discussion

Chapter 7

What is light?

Light is the electron agent (em) wave which is emitted from a hot body.

Luminous bodies are sources of light in which a hot body generates and emits light energy. Illuminous bodies do not generate light of their own.

Some text here about the topic of discussion

Multiple Choice

What is light?

• A wave which is emitted from a hot body

• A wave which is emitted from a cold body

How does light travel?

The direction of the path followed by light is called a ray. A group of rays are called a beam of light

There ae different types of beams; parallel, diverging, and converging beams.

Light travels in a straight line.

Subject | Subject

Some text here about the topic of discussion

How does light travel?

There are 3 materials that classify light

Opaque - does not allow light to pass through it

Translulent - allows light to pass through it partially

Transparent - allows light to pass through it totally

Opaque materials reflect light falling on them completely while translulent materials reflect light partially

Subject | Subject

Some text here about the topic of discussion

Multiple Choice

What is a beam of light?

• a bunch of line segments

• a bunch of rays

Multiple Choice

Which way does light travel?

• diagnal

• horizontal

• vertical

• straight

Reflec

Replace this with a sub-header that can be in multiple lines. ​

Duplicate this text as many times as you would like.

Some text here about the topic of discussion

Reflection of Light

Light travels in all directions. Light also travels in a certain medium.

When light reaches a given medium, boundary of another medium, some changes may happen. This is

-Some amount of light is absorbed

-The rest is turned back into the first medium

Subject | Subject

Some text here about the topic of discussion

​Reflection of Light

Reflecton is the lowering of a light ray from a surface (the change indirection of light as it moves from one medium to another)

Incidence ray is a ray that comes from the source

Reflected ray is a ray that is reflected

Normal line is a line that separates the incidence ray from the reflected ray

Angle of Incidence is an angle formed between I and n

Angle of Reflection is the angle formed between the normal line and the reflected ray.

Subject | Subject

Some text here about the topic of discussion

Multiple Choice

What is reflection?

• the lowering of light rays from the surface

• the raising of light rays from the surface

Multiple Choice

What is the incidence ray?

• a ray that comes from a mystery

• a ray that comes from a source

Multiple Choice

What is a reflected ray?

• a ray that is reflected

• a ray that iss not reflected

Multiple Choice

What is the normal line?

• a line that seperates the reflected ray and the normal line

• a line that seperates the incidence ray from the reflected ray

Multiple Choice

What is the angle of reflection?

• the angle formed between the reflected ray and the angle of incidence ray

• the angle formed beteen the normal line and the reflected ray

Multiple Choice

What is the angle of incidence

• Angle formed between i and n

• Angle formd between a and z

Reflection havs 2 laws

Law 1: The angle of incidence is equal to angle or reflection that is Oi=Or

Law 2: The incidence ray, the reflected ray, and the normal line all lie on the same place

Subject | Subject

Some text here about the topic of discussion

​Longitudinal and transversave waves

There are two main types of waves

Transverse wave- a wave in which the vibrations are perpendicular to the direction of wave motion. All transverse waves comprise of a series of crests and troughs.

Terms used in transverse waves are....

Subject | Subject

Some text here about the topic of discussion

Transverse Vocabulary

Wave lengths (λ)- the distance between two peaks or two trouphs

Amplitude- the maximum distance for the equilibrium position

Time period- one complete cycle performed by the wave

Frequency- is the number of complete cycles per second performed by a wave

Equilibrium position- a point at which the oscillating object comes to rest

Subject | Subject

Some text here about the topic of discussion

Formulas to remember

Time = 1/frequency or

Frequency= 1/Time

V = second/time = v= λ/time=λ x 1/t = λ times frequency

Since 1/time=frequency v(meter/second)= λ X 1/t=λf

V(meter/second)=Frequency X λ

Subject | Subject

Some text here about the topic of discussion

Multiple Choice

What is a transverse wave?

• a wave in which the vibrations are parallel

• a wave in which the vibrations are perpendicular

Multiple Choice

What is λ?

• a wave length (the distance between two peaks or two trouphs)

• a wave length (the distance between one peak or three trouphs)

• a frequency (the number of complete cycles per second performed by a wave)

• a time period (one complete cycle performed by the wave)

Multiple Choice

What is amplitude?

• the minimum distance for the equilibrium position

• the maximum distance for the equilibrium position

Multiple Choice

What is time period?

• one complete cycle performed by the wave

• one half way through cycle performed by the wave

Multiple Choice

What is frequency? (Hertz)

• The number of complete cycles per minute performed by a wave

• The number of complete cycles per second performed by a wave

Multiple Choice

What is equilibrium position?

• a point at which the oscillating object comes to rest

• a point at which the oscillating object doesn't stop

Plane Mirrors

The virtual image produced by a plane mirror appears to be the same distance away from the mirror as the object itself.

The height of an image as soon in a plane mirror is the same as the actual height of the object.

A plane mirror does not produce the same size as a real image

A plane mirror size and position is a same size, same distance away from the mirror

Subject | Subject

Some text here about the topic of discussion

Plane Mirrors

Virtual images are formed when light rays do not meet (cannot be seen on a screen)

Real images formed when light rays meet (can be seen on a screen)

Subject | Subject

Some text here about the topic of discussion

Multiple Choice

What are plane mirrors

• the vitual image of a mirror

• the unidentical image of a mirror

Multiple Choice

Plane mirrors produce the same size as a real image

• True

• False

Multiple Choice

Plane mirrors size and position is a same size, and same distance away from a mirror

• True

• False

Dispersion of light

The dispersion of hite light into its constituent colors are called dispersion

The band of seven colors obtained is called spectrum of white light

Dispersion appears because of refraction

When a beam of white light enters a prism all the colors of white light refract at different samples

Subject | Subject

Some text here about the topic of discussion

Propagation of Sound

Propagation refers to transmission of sound in a given medium

Medium refers to the material or substance through which sound is transmitted. They can be a liquid, solid or gas.

Sound always needs a medium

Subject | Subject

Some text here about the topic of discussion

Speed of Sound

Vt= Vo + 0.6

Subject | Subject

Some text here about the topic of discussion

Heat

Heat is a form of energy produced when energy changes

Heat flos from a region of higher temperature to a region or lower temperature

The SI unit of heat is Jo

Subject | Subject

Some text here about the topic of discussion

Echo

Echo is defined as a repeated souund that is caused by the reflection of sound waves from a surface.

Speed of an echo is....

V= 2 X meter/ time

Another Formula to know

V= second/time

Subject | Subject

Some text here about the topic of discussion

Multiple Choice

What is echo?

• The reflection of touch from a surface

• the reflection of sound from a surface

TC> TK b

Replace this with your body text. Duplicate this text as many times as you would like. All provided templates can be reused multiple times. Wish you a good day.

Happy teaching!

Subject | Subject

Some text here about the topic of discussion

​Quiz Review

Sound cannot travel in vacuum

when the amplitude of vibrations is halved, the loudness of sound becomes one-fourth

Noise pollution may cause prtial hearing impairment

A sound wave consists of places of higher pressure is called compressions and places of lower pressure is called rarefraction.

The speed of sound in a solid is quicker than the speed of sound in air

hen the frequency of the sound is increased, the wavelength becomes smaller

Subject | Subject

Some text here about the topic of discussion

​Quiz Review

Angle of incidence is the angle of which the light has hit

The image formed by a plane mirror is at a distance behind the mirror as the object next to the mirror

The image formed by a plane mirror is errect and straight and same in size

We are able to see the objects around us due to light reflection

A veal image cannot be obtained on a screen

One surface of mirror is made opaque by blow coating it followed by a thing coating of paint of lead oxide

A plane mirror doesn't reflect 100 percent light falling on it

The colour of an opaque object is the colour of light which it reflects on

Subject | Subject

Some text here about the topic of discussion

​Quiz Review

The method of heat transfer by movement of molecules of medium is convection

The physical quantity that represents the amount of heat required to change the temperature of 1 kg of a substance by 1 c is called specific heat capacity

Heat capacity describes the amount of heat required to raise the temperature of a unit mass of a substance by one degree

The hear energy from the sun is transmitted to the earth by radiation

Increasse n mass does not effect the heating of a body

Teh change of state from liquid to vapor that tasks place at the surface of liquid and at any temperatures is called vaporization

Heat is transferred along a metal spoon by condunction

Subject | Subject

Some text here about the topic of discussion

​Quiz Review

Melting Vaporization is when particles of matter absorb energy

Tempeature drop is not the effect of heating a body

The slowest to fastest sound are air water steel

Kalvin = celsius + 273.15

Celcius = 5/9 (Farenheight - 32)

Farenheight =

Subject | Subject

Some text here about the topic of discussion