Q: If the frequency ($$\nu) of a $$wave is $$6.0 \times 10$$^{14}$$ Hz, what is the wavelength ($$\lambda$$) in meters? Use c = 3.00$$ \times $$10^8 m/s.$$

$$\lambda = 5.0 \times 10$$^{-7}$$ m

Q: Which statement correctly explains why we see lightning before we hear thunder during a storm?

Light travels at $$3.00 \times 10^8$ m/s, much faster than sound.

Q: If the wavelength of a light wave is $$4.0 \times 10$$^{-7}$$ m, what is its frequency ($$\nu$$)? Use c = 3.00$$ \times $$10^8 m/s.$$

$$\nu = 7.5 \times 10$$^{14}$$ Hz

Question 1

Which of the following best describes the relationship between wavelength and frequency in electromagnetic radiation?

Accepted Answer

As wavelength increases, frequency decreases.

Question 2

The speed of light ($$c) in a $$vacuum is $$3.00 	imes 10^8$ m/s. Which equation correctly relates the speed of light to wavelength ($$\lambda$$) and frequency ($$
u$$)?

Accepted Answer

$$c = \lambda 	imes 
u$$

Question 3

A light wave has a wavelength of $$500 nm. $$What happens to its frequency compared to a light wave with a wavelength of $$700 nm$$?

Accepted Answer

The frequency is higher.

Question 4

Which type of electromagnetic radiation has the longest wavelength?

Accepted Answer

Radio waves

Question 5

If the frequency ($$
u) of a $$wave is $$6.0 	imes 10$$^{14}$$ Hz, what is the wavelength ($$\lambda$$) in meters? Use c = 3.00$$ 	imes $$10^8 m/s.$$

Accepted Answer

$$\lambda = 5.0 	imes 10$$^{-7}$$ m

Question 6

Which statement correctly explains why we see lightning before we hear thunder during a storm?

Accepted Answer

Light travels at $$3.00 	imes 10^8$ m/s, much faster than sound.

Question 7

Which region of the electromagnetic spectrum is responsible for the heat we feel from sunlight?

Accepted Answer

Infrared radiation

Question 8

Visible light consists of wavelengths between:

Accepted Answer

400 nm and 700 nm

Question 9

Which color of visible light has the shortest wavelength?

Accepted Answer

Violet

Question 10

A microwave oven uses electromagnetic radiation with a shorter wavelength than radio waves. What does this imply about the frequency of microwaves compared to radio waves?

Accepted Answer

Microwaves have a higher frequency than radio waves.

Question 11

If the wavelength of a light wave is $$4.0 	imes 10$$^{-7}$$ m, what is its frequency ($$
u$$)? Use c = 3.00$$ 	imes $$10^8 m/s.$$

Accepted Answer

$$
u = 7.5 	imes 10$$^{14}$$ Hz

Question 12

Which of the following is NOT a form of electromagnetic radiation?

Accepted Answer

Sound waves

Question 13

A scientist observes that as the frequency of electromagnetic radiation increases, its wavelength:

Accepted Answer

Decreases

Question 14

Which of the following best explains why objects appear colored to our eyes?

Accepted Answer

Objects reflect only certain wavelengths, which are detected by our eyes.

Question 15

Which of the following electromagnetic waves has the highest energy?

Accepted Answer

Gamma rays

Question 16

A prism separates white light into a spectrum of colors. This separation occurs because:

Accepted Answer

Different colors have different frequencies and wavelengths.

Question 17

Which of the following is the correct unit for frequency?

Accepted Answer

Hertz (Hz)

Question 18

If you increase the energy of electromagnetic radiation, what happens to its frequency?

Accepted Answer

Frequency increases.

Question 19

Which of the following statements about the electromagnetic spectrum is TRUE?

Accepted Answer

Gamma rays have the shortest wavelength and highest frequency.

Question 20

A wireless device uses electromagnetic radiation with higher frequencies than infrared. Which type of radiation is most likely used?

Accepted Answer

Microwaves

Electromagnetic Radiation: Wavelength, Frequency, and the Electromagnetic Spectrum

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