Wave and Energy Pt 2

Electromagnetic Wave

____ - are waves consist of a changing electric field and a changing magnetic field.

• Radio

• Microwave

• Infrared

• Visible

• Ultraviolet

• X-ray

• Gamma ray

Electromagnetic Spectrum Order in Radiotypes [ Highest to Lowest Wavelength ]

• Gamma ray

• X-ray

• Ultraviolet

• Visible

• Infrared

• Microwave

• Radio

Electromagnetic Spectrum Order in Radiotypes [Lowest tp Highest Frequency]

Red light

What color of light ?

• Infrared

• Microwave

• Radio

Violet

What color of light ?

• Gamma ray

• X-ray

• Ultraviolet

red to violet

What color of light ?

• Visible light

Violet

What color of light ?

• Shortest wavelength/highest energy

Red

What color of light ?

• Longest wavelength/lowest energy

b. longer

NOTE:

• In the diagram, the visible light spectrum is shown between the points labeled Red and Violet. Here's what the regions indicate:

  • Region A and B are to the left of red, which is the infrared and radio wave region.

  • Region C and D are to the right of violet, which includes ultraviolet, X-rays, and gamma rays.

  Since A and B are to the left of red light, they represent types of radiation with longer wavelengths than visible light.

1. Compared to the wavelengths of visible light, the wavelengths of the radiation in A and B shown above are

a. shorter

b. longer

c. just as long

d. not measurable

d. all these travel at the same speed

In a vacuum, all electromagnetic waves (including radio waves, infrared rays, gamma rays, visible light, X-rays, etc.) travel at the same speed:

2. Light is a form of electromagnetic wave. Comparing the speed of light with other forms of electromagnetic waves, which of the following travels at the slowest speed in vacuum?

a. radio waves

b. infrared rays

c. gamma rays

d. all these travel at the same speed

a. The AM makes use of low frequency and long wavelength of the electromagnetic spectrum.

3. In radios, the AM and FM bands differ in the frequency of the electromagnetic waves they can receive. Which of the following statement is true?

a. The AM makes use of low frequency and long wavelength of the electromagnetic spectrum.

b. The FM makes use of low frequency and short wavelength of the electromagnetic spectrum.

c. The AM makes use of high frequency and short wavelength of the electromagnetic spectrum.

d. The FM makes use of high frequency and long wavelength of the electromagnetic spectrum.

AM Radio

[FM Radio /AM Radio]

• Low frequency

• Long wavelength

FM Radio

[FM Radio /AM Radio]

• High frequency

• Short wavelength

radioactive

The spontaneous emission of radiation from the nuclei of atoms of certain substances termed as____ ?

• Alpha Radiation

• Beta Radiation

• Gamma Radiation

Types of Radiation [3]

Alpha Radiation

[Types of Radiation] fast-moving helium nuclei

Beta Radiation

[Types of Radiation] fast-moving electrons

Gamma Radiation

[Types of Radiation] high energy, highly penetrating protons

Beta and Gamma Radiation

[Types of Radiation] ____ [2] are both damaging to body tissues but are especially dangerous if a radioactive substance is ingested or inhaled.

loss of energy

When radiation takes place, there is ____ [loss/ gain] of energy.

Magnetic Field

_____ - is a region in space where the magnet affects another magnet

• current carrying conductor

• moving charges in vacuum.

Magnetic fields can affect ___ [2]

right angle

If a current carrying conductor is in a magnetic field, it moves to a direction at _____ to both the direction of I and B

perpendicular to each other

Magnetic force (F) is maximized when current I and magnetic field directions are ____ [perpendicular/parallel] to each other.

Electromagnetic Induction

____ -

• Current is induced when a conductor moves across a magnetic field or when a magnetic field moves with respect to a stationary conductor.

Current

___- is induced(produced) when a conductor moves across a magnetic field or when a magnetic field moves with respect to a stationary conductor.

• Relative velocity of the conductor and magnetic fields

• The strength of the magnetic field.

• Length of the conductor in the field

• Current is produced when a potential difference between two points in a circuit exist.

Factors of Induced Current [4]

Current

_____ - is produced when a potential difference between two points in a circuit exist.

Can magnetism induce current?

Yes, magnetism can induce current through electromagnetic induction.

electromagnetic induction

Magnetism can induce (produced) current through____ ?

Increase Voltage

Increase Current = _____ [increase/decrease] Voltage

Increase Strength of magnetic field (B)

Increase Current = _____ [increase/decrease] Strength of magnetic field (B)

Increase Length of the conductor that lies in magnetic field (L)

Increase Current = _____ [increase/decrease] Length of the conductor that lies in magnetic field (L)

Increase Rate of Change Magnetic flux

Increase Induced Voltage = ____ [increase/decrease] Rate of Change Magnetic flux