This question is about a progressive wave and a stationary wave.
Which statement is correct?
A progressive wave has at least one node.
All progressive waves are longitudinal.
All particles oscillating between two adjacent nodes in a stationary wave are in phase.
The superposition of two waves travelling in the same direction produces a stationary wave.
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Coherent radio waves from transmitters X and Y are emitted in phase. The waves interfere constructively at point Z.
The distance XZ is 16.0 m and the distance YZ is 20.0 m.
The radio waves have wavelength 
.
Which value of is not possible?
1.0m
2.0m
3.0m
4.0m
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A stationary sound wave, in its fundamental mode of vibration, is formed in a tube open at both ends.
The length of the tube is 0.17 m. The speed of sound in air is 340 m s−1.
Which row for this stationary wave is correct?
| Number of nodes | Frequency of stationary wave / Hz | |
| A | 1 | 500 |
| B | 1 | 1000 |
| C | 2 | 1000 |
| D | 2 | 2000 |
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Monochromatic light from a laser is incident normally on a diffraction grating.
A series of bright dots are formed on a distant screen.
Which two terms can be used to explain these bright dots?
diffraction, interference
reflection, interference
refraction, diffraction
refraction, reflection
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A double-slit is used in an interference experiment to independently investigate the light from two sources K and L. The light from the sources have different wavelengths.
The table below shows some data.
| Light source | Wavelength of light | Separation between adjacent bright fringes | Distance between screen and double‐slit |
| K | λ | 1.2 mm | D |
| L | 0.80λ | 0.50D |
What is the separation between adjacent bright fringes for source L?
0.48 mm
1.2 mm
1.9 mm
3.0 mm
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The diagram below shows the graphs of displacement x against time t for two waves S and T.
The waves meet at a point in space.
The superposition of these two waves produces a resultant wave.
What is the frequency f and the amplitude A of the resultant wave?
f = 100 Hz, A = 2.0 mm
f = 100 Hz, A = 4.0 mm
f = 200 Hz, A = 2.0 mm
f = 200 Hz, A = 4.0 mm
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Stationary waves are produced in a tube closed at one end and open at the other end. The fundamental frequency is 120 Hz.
What is a possible frequency of a harmonic for this tube?
60 Hz
240 Hz
360 Hz
480 Hz
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A vibrating tuning fork is held above the open end of a long vertical tube. The other end of the tube, which is also open, is immersed in a tank of water. The length L of the air column within the tube is changed by raising or lowering the tube.
The wavelength of sound from the vibrating tuning fork is 150.0 cm.
What length L of air column will not produce a stationary wave within the tube?
37.5 cm
75.0 cm
112.5 cm
187.5 cm
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