Interference MCQ (Multiple Choice Questions) PDF Download

For destructive interference, the path difference is

1. odd number of half wavelengths
2. even number of half wavelengths
3. whole number of wavelengths
4. even whole number of wavelengths

Constructive interference happens when two waves are

1. out of phase
2. zero amplitude
3. in phase
4. in front

Two waves with phase difference 180° have resultant of amplitude

1. one
2. zero
3. same as the single wave
4. doubles the single wave

If two waves are in phase and have same amplitude then resultant wave has

1. half of amplitude of single wave
2. same amplitude as single wave
3. twice of amplitude of single wave
4. thrice of amplitude of single wave

Extra distance travelled by one of waves compared with other is called

1. path
2. displacement
3. phase difference
4. path difference