# All Questions

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### What makes electrons behave like particles or waves at different times? [duplicate]

I am quite puzzled about the theory that electrons or light often behave as particles and sometimes as waves. So, I wanted to know more about this phenomena and what happens when and why.
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### Vertical throwing exercise [on hold]

I'm struggling with this question Assume an object is resting on the ground, in $t=0$ there is a force that starting to work on it, which grants him vertical acceleration towards up, $a=3m/s^2$, ...
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### Why is hydrogen, nitrogen, carbon and oxygen the most common constituents of interstellar molecules?

Could someone elaborate more on the use of the word "constituent"? Is the question basically asking why these four elements are the most prevalent in interstellar molecules? If so, why are they the ...
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### Black-hole meets Black-hole [duplicate]

What will happen if a black hole collides with another black hole of equal mass and diameter and what will be its effect on light?
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### What causes the Shubnikov-de Haas Oscillations?

If I have a 2DEG with a voltage in the $x$-direction and a $B$-Field in the $z$-direction (so I also get a hall-voltage in the $y$-direction (classicaly)). But if I do this stuff at low temperatures I ...
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### Find an angle in 3 dimensions [on hold]

I've had a good attempt at this question trying everything I could think of and the answer I got was 60 degrees yet still incorrect. It would be great if anyone could help me out. The boom ...
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### A particles lifetime in relation to the speed it travels with

Is it possible for a particles or any matter's lifetime in the universe to depend on it's speed?
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### Orbit of the Earth

The question I have really is in a few parts. First what if anything could cause the orbit of the Earth to start to diminish start to go towards the Sun closer on each revolution? ( edit to remove ...
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### Finding velocity using given angle [on hold]

Question: A body is projected with $50 \text{m/sec}$ at an angle of $53$ degree with the horizontal. After what time velocity makes an angle $33.7$ degree with horizontal? ($\tan 33.7 = 2/3$) My ...
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### 2-Dimensional motion query [on hold]

Question: A body is projected with speed u at an angle theta with the horizontal. (Following are the three parts in the question). Find the change in velocity in time t. Find the speed of body at a ...
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### Are angular acceleration and velocity frame dependent?

Basically what I am trying to ask is if a body has an angular velocity $\omega$ or angular acceleration $\alpha$ about an axis then will it have the same angular velocity and acceleration along any ...
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### Low-altitude EMP

Can a low-altitude EMP exist from a detonated nuclear weapon or is the higher altitude required for propagation of the relevant fields necessary to induce destructive currents?