1. ultrasound is used in clinical applications to probe soft tissues inside the body. To detect small and stiff objects like tumours the frequency used is around 5.0MHz. What molecular vibration period is caused by this ultrasound pulse?
Simple harmonic motion
Simple harmonic motion is a type of periodic motion in which an object undergoes oscillatory motion. The restoring force exerted by the object exhibiting SHM is proportional to the displacement from the equilibrium position. The force is directed towards the mean position. We see many examples of SHM around us, common ones are the motion of a pendulum, spring and vibration of strings in musical instruments, and so on.
Simple Pendulum
A simple pendulum comprises a heavy mass (called bob) attached to one end of the weightless and flexible string.
Oscillation
In Physics, oscillation means a repetitive motion that happens in a variation with respect to time. There is usually a central value, where the object would be at rest. Additionally, there are two or more positions between which the repetitive motion takes place. In mathematics, oscillations can also be described as vibrations. The most common examples of oscillation that is seen in daily lives include the alternating current (AC) or the motion of a moving pendulum.
1. ultrasound is used in clinical applications to probe soft tissues inside the body. To detect small and stiff objects like tumours the frequency used is around 5.0MHz. What molecular vibration period is caused by this ultrasound pulse?
2. the tuning fork prongs vibrate at 350 Hz with amplitude of 0.500mm. a small insect with a mass of 0.025g lands on the tip of one of the prongs. assuming that its mass has a negligible effect on the frequency of oscillation what is the maximum kinetic energy of the insect?
3. the period of oscillation of an irregularly shaped object is 1.2s its mass is 1.0 kg and it is hanged from one of its ends to oscillate, which is 3.5 cm away from its center of mass. what is its moment of inertia?
4. What would the world be without waves? Give two specific examples and discuss it.
5. A speedboat sends out a wave that rocks a small boat where a senior high school student is standing. She notices that the height of the waves from trough to peak is 0.60 m and that the wave rock the small boat with a period of 2.0 s the distance between crests is 1.9 m. what are: a. the amplitude; b. the wavelength; c. the frequency; d. the wave speed; e. wave number; f.
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