Mechanical & Electromagnetic Waves

21. The Doppler effect causes the pitch of a sound to change as a moving source passes by an observer. True or False?

22. Red light has a longer wavelength than blue light. True or False?

23. Red light has a higher frequency than blue light. True or False?

24. The electromagnetic spectrum is the range of all possible frequencies of electromagnetic radiation. True or False?

25. The electromagnetic spectrum includes all of the following except:

a) Radio waves

b) Microwaves

c) X-rays

d) Sound waves