ELECTROMAGNETIC SPECTRUM TEST QUESTIONS

A. Choose the letter of the correct answer.

1. Which two waves lie at the ends of the visible spectrum?

a.  Infrared and Ultra-violet rays

b.  Radio waves and Microwaves

c.  Radio waves and X-rays

d.  X-rays and Gamma rays

2. In the visible spectrum, which color has the longest wavelength?

a.  Blue                        b. Green                      c. Red                          d. Violet

3. Which property spells the difference between infra-red and ultra-violet radiation?

a.  Color

b.  Speed in vacuum

c.  Wavelength

d.  None of the above

4. A certain radio station broadcasts at a frequency of 675 kHz. What is the wavelength of the radio waves?

a.  280 m

b.  324 m

c.  400 m

d.  444 m

5. What type of electromagnetic waves is used in radar?

a.  Infrared rays

b.  Microwaves

c.  Radio waves

d.  Ultra-violet rays

6.  Which electromagnetic wave carries more energy than the others?

a.  microwaves

b.  radio waves

c.  UV radiation

d.  visible light

7.  What electromagnetic wave is sometimes called heat rays?

a.  gamma rays

b.  infrared

c.  radio waves

d.  visible light

8.  What is the frequency range of UV radiation?

a.  3.5 x 10⁹   -   3 x 10¹¹ Hz

b.  3.5 x 10¹¹   -   3 x 10¹¹⁴ Hz

c.  7.5 x 10¹⁴   -    3 x 10¹⁶Hz

d.  7.5 x 10¹⁶   -  3 x 10¹⁹ Hz

9.  What is the range of frequencies are our eyes sensitive to?

a.  3 x 10⁹   -    3 x 10¹¹Hz

b.  3 x 10¹¹  -   4 x 10¹⁴Hz

c.  4 x 101⁴ - 7.5 x 10¹⁴Hz

d.  7.5 x 10¹⁴ -   3 x 10¹⁶Hz

10.  What is the wavelength of the wave with a frequency of 3 x 109 Hz?

a.  1.0 x 10^-1m

b.  1.0 x 10¹ m

c.  1.0 x 10^-2m

d.  1.0 x 10²m

11. Which of the following has the longest wavelength?
            a.  Red light
            b.  yellow light
            c.  violet light
            d.  blue light

12.  Which of the following is the highest frequency?
            a.  Radio waves
            b.  Microwaves
            c.  Gamma rays
            d.  Infrared waves

13.  What type of waves are used to transmit cellular telephone messages?
            a.  Gamma rays
            b.  Radio waves
            c.  Microwaves
            d.  Visible light

14.  Electromagnetic waves that you can see are called

            a.  Infrared rays

            b.  Microwaves

            c.  X-rays

            d.  Visible light

15.  The visible spectrum of light from the longest to shortest wavelength is:

                a.  violet, indigo, blue, green, yellow, orange, red      

                b.  infrared, ultraviolet, gamma, X-rays, microwaves   

                c.  red, orange, yellow, green, blue, indigo, violet

                d.  radio, microwave, infrared, visible, ultraviolet, X-ray, gamma