1. What is the main difference between mechanical and electromagnetic waves?
A. Mechanical waves involve transfer of energy, electromagnetic waves do not.
B. Mechanical waves require a medium to travel in, electromagnetic waves do not.~~~~
C. Mechanical waves have amplitude and wavelength, electromagnetic waves do not.
D. Mechanical waves have speed and frequency, electromagnetic waves do not
2. Which waves have the longest wavelength and lowest energy on the electromagnetic spectrum?
C. Radio waves~~~~~
D. Gamma rays
3. What is true about X-rays and microwaves?
A. X-rays have grater speed than microwaves
B. X-rays have grater amplitude than microwaves.
C. X-rays have grater frequency than microwaves.
D. X-rays have grater wavelength than microwaves. ~~~~~
1 and 2 are ok.
On #3 you confuse frequency and wavelength. (and that's "greater")posted by Steve
3. WRONG X has greater energy/freequency, just below Gammaposted by Damon
3 should be frequency but the others are good! ( :posted by potato_tactics