C. Choose the letter of the correct answer.




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

A. microwaves B. radio waves. C. UV radiation. D. visible light





2.What electromagnetic wave is sometimes called heat rays?

A. gamma rays B. infrared C. radio waves. D. visible light





3. What is the frequency range of UV radiation?

A. 3.5 x 10° - 3 x 1011 Hz
C. 7.5 x 1014 - 3 x 1016 Hz
B. 3.5 x 1011-3 x 1014 Hz
D. 7.5 x 1016 - 3 x 1019 Hz





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

A. 3.5 x 10° - 3 x 1011 Hz
C. 7.5 x 1014 - 3x 1016 Hz
B. 3.5 x 1011.3 x 1014 Hz D. 7.5 x 1016- 3 x 1019 Hz





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

A. 1.0 x 101 m
C. 1.0 x 102 m
B. 1.0 x 101 m
D. 1.0 x 102 m​