1. A wave has a wavelength of 10 mm and a frequency of 5.0 hertz. What is its speed?
A. 50 mm/s
B. 50 hertz/s
C. 2.0 mm/s
D. 0.50 mm/s
2. Which type of mechanical wave needs a source of energy to produce it?
A. a transverse wave
B. a longitudinal wave
C. a surface wave
D. all of the above
3. When a wave strikes a solid barrier, it behaves like a basketball hitting a backboard. This wave behavior is called
A. constructive interference.
B. diffraction.
C. refraction.
D. reflection.
4. In refraction, when a wave travels from one medium to another, it
A. changes speeds.
B. stays in step.
C. always moves in the same direction.
D. travels in the opposite direction.
5. Transverse and longitudinal waves both
A. have compressions and rarefactions.
B. transfer energy through a medium.
C. move at right angles to the vibration of the medium.
D. are capable of moving the medium a long distance.
6. Suppose two waves collide and the temporary combined wave that results is smaller than the original waves. What term best describes this interaction?
A. diffraction
B. destructive interference
C. standing wave formation
D. constructive interference
7. To what is amplitude related?
A. the amount of energy carried by the wave
B. the maximum displacement from the rest position
C. neither A nor B
D. both A and B
1. To calculate the speed of a wave, we can use the formula: speed = wavelength * frequency. Given that the wavelength is 10 mm and the frequency is 5.0 Hz, we can plug these values into the formula: speed = 10 mm * 5.0 Hz = 50 mm/s. Therefore, the correct answer is A. 50 mm/s.
2. The mechanical wave that needs a source of energy to produce it is a longitudinal wave. A longitudinal wave is a type of wave where the particles of the medium vibrate back and forth in the same direction that the wave is traveling. This vibration requires an initial source of energy to start the wave.
3. When a wave strikes a solid barrier and behaves like a basketball hitting a backboard, this wave behavior is called reflection. Reflection occurs when a wave bounces back after striking a barrier or an obstacle. It follows the law of reflection, which states that the angle of incidence is equal to the angle of reflection.
4. In refraction, when a wave travels from one medium to another, it changes speeds. Refraction is the bending of a wave as it passes from one medium to another, and it occurs because the wave travels at different speeds in different mediums. As the speed changes, the direction of the wave also changes.
5. Both transverse and longitudinal waves transfer energy through a medium. Transverse waves are characterized by particle motion that is perpendicular to the direction of wave propagation. Longitudinal waves, on the other hand, have particle motion that is parallel to the direction of wave propagation. Both types of waves transfer energy through their respective mediums.
6. When two waves collide and the temporary combined wave that results is smaller than the original waves, the term that best describes this interaction is destructive interference. Destructive interference occurs when two waves meet and their amplitudes have opposite signs. This cancels out or reduces the amplitude of the resulting wave.
7. The amplitude of a wave is related to both the amount of energy carried by the wave and the maximum displacement from the rest position. Amplitude is a measure of the maximum distance that particles in the wave's medium move from their equilibrium or rest position. It represents the energy of the wave, so the correct answer is D. both A and B.
1. Option A. 50 mm/s
2. Option D. all of the above
3. Option D. reflection
4. Option A. changes speeds
5. Option B. transfer energy through a medium
6. Option B. destructive interference
7. Option D. both A and B
1. V = L*F = 0.01*5 = 0.05 m/s=50 mm/s.
4. Changes speed.