Recent content by GravityGirl

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    Graduate What Differentiates Spin Liquids from Spin Solids and Spin Glasses?

    i don't understand. so in a spin soild there is short range order like nearest neighbor? so what does that mean if a spin liquid doesn't have strong spin correlations? what i understand is that a spin soild/liquid arises from two things...i am focusing on the pryochlore structure where the...
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    Graduate What Differentiates Spin Liquids from Spin Solids and Spin Glasses?

    What is a spin liquid as opposed to a spin solid or a spin glass? I know that a spin liquid is generally defined by geometric frustration in the electronic spins of that material (i.e. pryochlore structure)...but how is this different from a spin solid? Can it be that the lattice of the...
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    Quantum Tunneling: Electron or Proton Has Greater Probability?

    does it have to do with that fact that a proton has a longer wavelength than the electron at the same energy?
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    Quantum Tunneling: Electron or Proton Has Greater Probability?

    An electron and proton with the same energy E approch a potential barrier whose height V is greater than E. Do they have the same probability of getting through? If not, which has a greater probability? Why is that true? So if the electron and proton have the same energy, that means that the...
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    How Many Photons Does a 1-kW Radio Transmitter Emit at 880 kHz?

    should i use the equation E(light)=hc/wavelength? what is h in this equation?
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    How Many Photons Does a 1-kW Radio Transmitter Emit at 880 kHz?

    should i use the equation E(light)=hc/wavelength? what is h in this equation?
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    How Many Photons Does a 1-kW Radio Transmitter Emit at 880 kHz?

    a 1-kW raido transmitter operates at 880kHz. How many photons per second does it emit? Power=work/time Power=change in KE/time f=1/T T=1/880kHz so 1 kw=change in KE/1.136x10^-6 change in KE=.00136 J i don't know if i am doing this right. please point me in the right direction.
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    How Many Photons Does a 1-kW Radio Transmitter Emit at 880 kHz?

    a 1-kW raido transmitter operates at 880kHz. How many photons per second does it emit? Power=work/time Power=change in KE/time f=1/T T=1/880kHz so 1 kw=change in KE/1.136x10^-6 change in KE=.00136 J i don't know if i am doing this right. please point me in the right direction.
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    What Lens Power Does a 77-Year-Old Need to Correct Near-Sightedness?

    near point is the nearest point of an object that a relaxed eye can see. usually for a normal eye it is about 25 cm.
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    What Lens Power Does a 77-Year-Old Need to Correct Near-Sightedness?

    i tired 2.5 cm and 11.5 cm and that didn't work. any other suggestions
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    What Lens Power Does a 77-Year-Old Need to Correct Near-Sightedness?

    A 77 year old man has a near point of 115 cm. What power lens (in diopters) does the man need in order to be able to see an object clearly at the normal near point of 25 cm? Assume that the man will get contact lenses, that is neglect the two centimeters that glasses would be away from the eye...
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    Galvanometer has a coil with a resistance

    ok so the voltage drop across the galve. is = to the voltage drop across Rs and Vg=IR=.131*81=10.61 so Vr=10.61=RI and that is 10.61=R(1.1-.131)=10.95 ohms
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    Galvanometer has a coil with a resistance

    ok...i got the first one...but i am still confused on the second part where am i going wrong?
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    Galvanometer has a coil with a resistance

    part 1: A galvanometer has a coil with a resistance of 81 W. A current of 131 mA causes full scale deflection. Calculate the value of the series resistor that is required in order to use the galvanometer as a Voltmeter with 40 V full scale. so to make a voltmeter, the galvanometer and...
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    Calculating Resistance of a Copper Pipe Based on Length and Diameter

    ok ok...i will do that