The speed of a sound wave in sea water is 1500 m/s. A ship with a sonar system sends out a sonar signal. The echo from the sea floor is received after
6 s. If the frequency of the wave is 440 Hz, calculate:
1.The depth of the sea
2.wavelength of the wave
3.period of wave

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If the force applied to an object remains constant, is more power needed for the object to move faster ? explain

Explain the comparisons between nature and packingtown that appears on pages 81 and 82 answer

The nuclear potential that binds protons and neutrons in the nucleus of an atom is often approximated by a square well. imagine a proton conned in an innite square well of length 105 nm, a typical nuclear diameter. calculate the wavelength and energy associated with the photon that is emitted when the proton undergoes a transition from the rst excited state (n 2) to the ground state (n 1). in what region of the electromagnetic spectrum does this wavelength belong?