Top answers

Physics
A Level

The electric potential energy of two protons is 1.0MeV. Calculate their separation

First thing first, we need to fully understand what we are asked and what topic we are being tested on. From this question, we can see that we are involved in electric fields, sicn...

Answered by George K. Physics tutor
8563 Views

An unknown capacitor is charged to 6v, its maximum value, then discharged through a 1k ohm resistor. If the capacitor voltage is 3v, 0.3 seconds after starting to discharge, what is the capacitance of the unknown capacitor?

To start, the equation to use can be identified as the capactior discharge equation V(t) = Vmaxe-t/RC. From here, we can see that this equation can be solved to give capacitance, and...

Answered by Alexander R. Physics tutor
2873 Views

An electron and a proton are in any electric field E=5x10^2 V/m. What is their speed 1.0 cm after being released?

F=Eq= 5x10^2 x 1.6x10^-19 = 8x10^-17 N

Kinetic energy theory: deltaEc= Fxd =1/2mv^2

thus v= squareroot(2xFxd/m)

v(proton) = squareroot(2x8x10^-17x1x10^-2/9.1x10^-31)=1.3x 10^6 m/s

...
Answered by Emma H. Physics tutor
1650 Views

Explain the Doppler Shift Effect, and how it can be used to measure blood flow in the body.

The Doppler Shift describes a change in frequency of a wave that an observer sees when moving relative to the source of the waves.

A good example of the Doppler Shift is the change in pitch (how hi...

Answered by Astrid B. Physics tutor
2006 Views

why does photoelectric emission occur only when there is a certain threshold frequency of incident radiation?

According to the particle theory of light, hf=φ+KEmax, so along with the minimum amount of energy required, there is a minimum frequency as well, φ= hfo. Thus, the incident photon must have a f...

Answered by Nikolas P. Physics tutor
2337 Views

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