i. can be produced by thermionic emission
ii. have low frequencies
iii. have short wavelengths.
A. i only
B. ii only
C. iii only
D. i and iii only
Correct Answer: Option C
C. iii only
i. can be produced by thermionic emission
ii. have low frequencies
iii. have short wavelengths.
A. i only
B. ii only
C. iii only
D. i and iii only
Correct Answer: Option C
C. iii only
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