26.2 EMF in Space ม5

Electromagnetic waves vary in

• the speed they travel in a vacuum.

• wavelength and frequency.

• the way they reflect.

• the orientation of their electric and magnetic fields.

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NGSS.HS-PS4-1

To calculate the frequency of an electromagnetic wave, you need to know the speed of the wave and its

• wavelength.

• intensity.

• refraction.

• amplitude.

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NGSS.HS-PS4-1

An electromagnetic wave in a vacuum has a wavelength of 0.07m. What is its frequency?

• f= 3.0x 10⁸ m/s

• f= 3.0x 10⁹Hz

• f=4.3x 10⁹Hz

• f=4.3x 10⁸m/s

A communications satellite transmits a radio wave at a frequency of 5.0 x 10⁹ Hz. What is the signal’s wavelength? Assume the wave travels in a vacuum.

• 60m

• 60mm

• 60cm

• 60dm

What is the electromagnetic spectrum?

• The full range of wave frequencies of electromagnetic radiation is called the electromagnetic spectrum.

• The rainbow

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NGSS.HS-PS4-3

NGSS.HS-PS4-4

Which is an example of a radio wave

• television

• heat lamp

• vision

• sun light

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NGSS.HS-PS4-3

NGSS.HS-PS4-4

What is the name of the specific frequency that a radio station is assigned and uses to broadcast signals?

• carrier wave

• microwave

• radio waves

• transceiver

Which wave has the largest wavelength?

• A
• B
• C
• None (same wavelength)

Tags

NGSS.HS-PS4-1

Which wave has the largest frequency?

• A
• B
• C
• None (same frequency)

Tags

NGSS.HS-PS4-1

A dish antenna can accept signals from..

• All directions

• From one specific direction only

• Waves that are half the amplitude of the parabolic diameter of the dish

• Any radiowave or microwave capacitor