A. diffraction of sound waves
B. constructive and destructive interference
C. polarization
D. destructive interference
A. greater than one meter
B. less than one meter
C. one meter
D. a foolish question
A. 40 W bulb
B. 60 W blub
C. 100 W blub
D. all will burn equally brightly
A. collector
B. emitter
C. base
D. any of above
A. Zero magnitude
B. No specified direction
C. Both A and B are correct
D. Both A and B are not correct
A. Maximum
B. Zero
C. Equal to the weight of the stone
D. Less than the weight of the stone
A. The ions in a crystal are well arranged
B. The lines in a diffraction grating cannot reflect X-rays.
C. The penetration power of X-rays is high in a diffraction grating
D. The wavelengths of X-rays are of the same order of magnitude as the separation between atoms in a crystal