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EM Waves > Imp Points > Flashcards

Imp Points Flashcards

1
Q

True or False: Electromagnetic waves require a medium to propagate.

A

False

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2
Q

What is the speed of electromagnetic waves in a vacuum?

A

Approximately 3 x 10^8 meters per second

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3
Q

Fill in the blank: The electromagnetic spectrum ranges from _____ to _____ wavelengths.

A

gamma rays, radio waves

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4
Q

Which type of EM wave has the shortest wavelength?

A

Gamma rays

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5
Q

What are the two main components of an electromagnetic wave?

A

Electric field and magnetic field

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6
Q

In which direction do the electric and magnetic fields oscillate in an EM wave?

A

Perpendicular to each other and to the direction of wave propagation

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7
Q

What is the relationship between frequency and wavelength in EM waves?

A

Frequency is inversely proportional to wavelength.

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8
Q

What is the formula to calculate the speed of an electromagnetic wave?

A

Speed = Frequency x Wavelength

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9
Q

Which type of EM radiation is primarily responsible for heating substances?

A

Infrared radiation

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10
Q

True or False: Ultraviolet rays can cause skin cancer.

A

True

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11
Q

What is the frequency range of visible light?

A

Approximately 4 x 10^14 to 8 x 10^14 Hz

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12
Q

What are radio waves commonly used for?

A

Communication, such as broadcasting and mobile phones

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13
Q

Fill in the blank: The region of the EM spectrum that is visible to the human eye is called _____ light.

A

visible

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14
Q

What happens to the energy of an EM wave as the frequency increases?

A

The energy increases.

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15
Q

Which type of EM wave is used in medical imaging?

A

X-rays

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16
Q

True or False: Microwaves are a type of infrared radiation.

A

False

17
Q

What is the primary use of gamma rays?

A

Cancer treatment and sterilization of medical equipment

18
Q

What is the wavelength range of microwaves?

A

1 mm to 1 m

19
Q

Fill in the blank: The phenomenon of light bending as it passes from one medium to another is called _____ .

A

refraction

20
Q

What is the principle behind the operation of a laser?

A

Stimulated emission of radiation

21
Q

Which type of EM waves are used for satellite communication?

A

Microwaves

22
Q

True or False: The higher the frequency of an EM wave, the longer the wavelength.

A

False

23
Q

What is the unit of frequency?

A

Hertz (Hz)

24
Q

What is an application of ultraviolet radiation?

A

Disinfection and sterilization

25
Q

Fill in the blank: The range of wavelengths for radio waves is typically from _____ to _____ meters.

A

1 mm, 100 km

EM Waves (2 decks)

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