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Science
Physics
Acoustics
6th Grade - Chapter 2 Sound
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Terms in this set (16)
decibel
The most common unit used to express loudness
Doppler effect
An observed change in the frequency of a wave when the source or observer is moving.
Echo
A reflected sound wave.
Echolocation
The process of using reflected sound waves to find objects.
Interference
The combination of two or more waves that result in a single wave
Longitudinal
A wave in which the particles of the medium vibrate parallel to the direction of the wave motion.
Loudness
The extent to which a sound can be heard.
Pitch
A measure of how high or low a sound is perceived to be , depending on the frequency of the sound wave.
Resonance
A phenomenon that occurs when two objects naturally vibrate at the same frequency.
Sonar
A system that uses acoustic signals and returned echoes to determine the location of objects, or to communicate.
Soundwave
A longitudinal wave that is caused by vibrations and that travels through a material medium.
Ultrasound
Sound waves with frequencies above 20,000 Hz.
Wavelength
...
Amplitude
...
Crest
...
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Verified questions
PHYSICS
(a) A certain nucleus has radius 5 fm. $$ (1 fm = 10 ^{-15} m.) $$ Find its cross section a in barns. $$ (1 barn = 10^{-28} m^2.) $$ (b) Do the same for an atom of radius 0.1 nm. $$ (1 nm = 10^{-9} m.) $$
PHYSICS
Consider an infinite solenoid with circular cross section. The current is I, and there are n turns per unit length. Show that the magnetic field is zero outside and $B=\mu_{0} n I$ (in the longitudinal direction) everywhere inside. Do this in three steps as follows. (a) Show that the field has only a longitudinal component. Hint: Consider the contributions to the field from rings that are symmetrically located with respect to a given point. (b) Use Ampère’s law to show that the field has a uniform value outside and a uniform value inside, and that these two values differ by $\mu_{0} n I$. (c) Show that $B \rightarrow 0$ as $r \rightarrow \infty$. There are various ways to do this. One is to obtain an upper bound on the field contribution due to a given ring by unwrapping the ring into a straight wire segment, and then finding the field due to this straight segment.
PHYSICS
Light rays emanating in air from a point object on axis strike a plano-cylindrical lens with its convex surface facing the object. The lens has a radius of curvature of $5 \ \mathrm{cm}$, a refractive index of $1.60$, and an axial length of $7 \ \mathrm{cm}$. Describe the line image by length and location if the point object is only $6 \ \mathrm{cm}$ from the lens.
PHYSICS
Glycerin is poured into an open U-shaped tube until the height in both sides is 20 cm. Ethyl alcohol is then poured into one arm until the height of the alcohol column is 20 cm. The two liquids do not mix. What is the difference in height between the top surface of the glycerin and the top surface of the alcohol?
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