Speed of Light

Calculate the wavelength of light that has a frequency of 5.2 x 10^{12 1}/s.

• 5.8 x 10 ^-5 m

• 5.8 x 10 ^-7 m

• 5.19 x 10 ¹⁴ m

• 1.56 x 10 ²³ m

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NGSS.HS-PS4-1

EM waves _______ travel the same speed in a vacuum. 

• never

• sometimes

• always

• can

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NGSS.HS-PS4-1

The relationship between wavelength and frequency is λ=c/f.  Calculate the wavelength of light that has a frequency of 5.2 x 10¹² 1/s. The speed of of light is 3.0x 10⁸ m/s.

• 5.8 x 10 ^-5 m

• 5.8 x 10 ^-7 m

• 5.19 x 10 ¹⁴ m

• 1.56 x 10 ²³ m

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NGSS.HS-PS4-1

IRAS, the Infrared Astronomy Satellite launched by NASA in 1983, had a detector that measured infrared or heat radiation from different regions of space. What is the frequency of infrared light that has a wavelength of 1.10 X 10^-6 m?

• 3.67 x 10^-15 Hz

• 3.67 x 10^-3 Hz

• 2.73 x 10² Hz

• 2.73 x 10¹⁴ Hz

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NGSS.HS-PS4-1

What is the speed of light?

• 3.0x10⁸ ms

• 3.0x10⁸ m/s

• 6.626x10^-34 Js

• 6.626x10^-34 J/s

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NGSS.HS-PS4-1

NGSS.HS-PS4-3

Match the following missing from the table

• m/s

• variable for frequency

• distance

• unit for time

• f

• term for d or m

• Unit for speed of light

• s

• variable for wavelength

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NGSS.HS-PS4-1

How long does it take light to travel a distance of 8 x 10¹⁵ m in a vacuum?

• 3.75x10⁸

• 3.75x10^-8

• 2.66x10⁷

• 2.66x10^-7

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NGSS.HS-PS4-1

What is the speed of light in a vacuum?

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NGSS.HS-PS4-1

Which of the following equations represents the relationship between energy, mass, and the speed of light?

If light travels from air into water, what happens to its speed?

• It decreases

• It increases

• It remains the same

• It becomes zero

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NGSS.HS-PS4-1