All Questions
Tagged with frequencyhomework-and-exercises
98 questions
0votes
1answer
52views
Which perspective is correct for moving source and observer?
A fire engine is moving at 50 m/s and sounding its horn of frequency 1500 Hz. A van in front of the fire engine is moving at 35 m/s in the same direction. What is the frequency that the driver of the ...
0votes
1answer
80views
What is the spectrum of a broken square drum?
Given a square drum with sides length equal to $L$, the squared raised frequencies are $(\pi m/L)^2 + (\pi n/L)^2 $ with $m,n \in \mathbb{N}^*$. Here we have four boundary conditions (no vibration on ...
- 768
1vote
4answers
304views
$0$th overtone in closed organ pipes
I know about $1$st, $2$nd or other overtones in the formula of frequency in a one-sided open system (specifically in closed organ pipes) that is $$ f = \frac{\left( 2 n + 1 \right) v}{4 L} \tag{1} \...
0votes
2answers
70views
Dimensional Analysis and Linear Correlation
I was introduced to a silly way to derive the 'de broglie formulae': Both $\left(\frac{p}{k}\right)$ and $\left(\frac{E}{\omega}\right)$ have the same dimension, and it has to be $\left(\frac{M \cdot ...
- 123
1vote
1answer
69views
How to find frequency of the resulting wave where amplitude aren't same? [closed]
In the superposition of two coherent waves $($at $x=0$$)$ given by $$y_1=4\sin(300\pi t)$$ and $$y_2=2\sin(308\pi t).$$ Find the frequency of the resulting wave and the frequency at which the ...
2votes
3answers
2kviews
What does $\omega$ mean in SHM?
In SHM, $a=- x\omega^2$ and $max(a) = ±A\omega^2$, but what does $\omega$ mean, because i cannot see anything related to circular motion in SHM like to and from motion of a particle on $y$ axis about ...
1vote
0answers
34views
The effect of spring constant $k$ (N/mm) on period, frequency under water (no mass attached with spring) [closed]
springs having different stiffness (N/mm) attached with cylinder of specific diameter in open channel flow (water) fully submerged in water. the direction of the spring and flowing water are inline. ...
-1votes
1answer
122views
How to calculate the wavelength of the sound in the tube in terms of $L_1$? [closed]
A speaker emitting a sound of frequency 450 Hz is placed above a tube of 54.0 cm high that is filled with water as shown in Figure 1.1. The water is allowed to flow out of the tube slowly. A loud ...
6votes
4answers
724views
What frequency of cord shaking maintains the same vertical motion for a point on the cord after increasing the wave speed on the cord?
I'm studying for my upcoming AP Physics 1 exam but can't figure out this problem A student shakes a horizontally-stretched cord, creating waves. The graph above shows the vertical position $y$ as a ...
0votes
2answers
973views
Speed of the Standing Wave in A Pipe
I’m studying standing waves and I got stuck with this question. The answer key says ‘A’ is the correct answer, but I think ‘B’ is the correct answer. My reasoning. The speed of the wave depends on the ...
- 75
1vote
2answers
2kviews
Spring-mass system in an elevator
I have a conceptual doubt. If we have a mass m hanging from an ideal spring, attached to the ceiling of an elevator... what happens to the period if the elevator starts going up or down with constant ...
- 39
1vote
2answers
1kviews
How to find frequency response of a damped spring mass system using the Laplace transform?
I would like to find the frequency response of a spring mass system of multiple degrees of freedom by using the Laplace transform. I think I know how to do this with one mass oscillating, however I ...
0votes
1answer
97views
Why does amplitude modulated wave take the frequency of a carrier signal when passed through air?
If a message signal of frequency $f_m$ is amplitude modulated with a carrier signal of frequency $f_c$ and radiated through an antenna, the wavelength of the corresponding signal in air is ans: $\frac{...
- 8,249
0votes
1answer
79views
Factor of two when finding the number of AM stations which can be fit into a bandwidth given the highest modulating frequency
How many AM broadcast stations can be accommodated in a 100 KHZ bandwidth if the highest modulating frequency of carrier is 5 kHZ? Ans. Solve by using the formula:$$ \text{total band width}= 2 ( \text{...
- 8,249
1vote
1answer
41views
Find the frequency of the first two harmonics of a vibrating string
I have a string of length $2 \;\text{m}$ and the wave velocity is $120 \;\text{m/s}$, find the frequency of the first two harmonics. My attempt, what I must do is to solve the wave equation on the ...
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