# All Questions

1answer
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### Harmonic motion equation - non-null right hand side

Considering the following motion equation : $$\ddot x + \frac{a^2 b^2}{c^2} x = -V \frac{a b}{c^2}$$ where $a$, $b$, $c$ and $V$ are all constant. One can identify the ...
0answers
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### How can I get the sensitivity of some eye cone at a specific wavelength?

The following graph shows the sensitivity for eye cones and rods, but I want to know e.g. what is the red cone sensitivity for a wavelength of 500 nm? How can I find an answer for questions like this?...
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### Total dilation of a signal from Tau Sagittarii [on hold]

Please forgive my ignorance, but I'm attempting to figure out how to do this... I want to learn how to evaluate the total dilation of a signal (waveform) leaving Tau Sagittarii to us. This assumes ...
0answers
31 views

### How are coherent astronomical objects imaged?

I am studying astronomical imaging, and am curious about how to image astronomical objects which are coherent. Stellar interferometry measures the mutual coherence function of a star, and then uses ...
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36 views

### Charged pendulum oscillations

Recently, a question was asked in our school, regarding the calculation of the time period of a charged pendulum bob suspended in an electric field with the help of an insulating thread(gravity also ...
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29 views

### Could Earth being multipolar 600 million years ago might have caused Cambrian radiation?

According to some of the latest research Earth might have been multi polar instead of being bipolar 650 million year's ago (http://phys.org/news/2016-06-earth-ancient-magnetic-field.html) Do you think ...
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### Decomposition of the Time-Evolution Operator: Translationally Invariant MPO

Hello everyone myself Sudipto. Currently I'm learning the matrix product state technique in order to simulate 1d spin system and study different properties of the system form quantum information ...
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24 views

### how can I detect cosmic muons from background?

Is there anything I should be careful with if I would like to detect muon at sea level? Noise background? Threshold? Even signals from other particle with stronger flux rate?
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### use of earth magnetic field

If we use earth magnetic field as a big magnet and take earth opposite charged electromagnet than it is possible that earth opposite charged electromagnet repel from earth surface.
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### What is the difference between the light coming from Moon and the Sun?

The moon surface is reflective so, we should have the same light spectrum. And yet there is a difference in the quality of these two lights.

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