Questions Asked

masha2204:
You have a converging lens which focuses the sunrays into a small spot about
12 cm from the lens. Would you be able to tell what a focal le…
 updated one year ago
 1 reply
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masha2204:
You have a converging lens which focuses the sunrays into a small spot about
12 cm from the lens. Would you be able to tell what a focal le…
 updated one year ago
 No Medals Yet

masha2204:
Your dad’s spectacles have a +3 D optical power. He put them on a table. Where
do you expect to ﬁnd an image of an ant which sits still 0.5…
 updated one year ago
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masha2204:
Solve this system w/Elimination
x+y+z=3
2xy+z=2
…
 updated one year ago
 3 replies
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masha2204:
A layer of olive oil is poured on top of a layer of water in a container. A light ray passing from the oil to the water has an angle of inci…
 updated one year ago
 2 replies
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masha2204:
On a sunny day, sunrays which propagate in the water make an angle of 50◦ with the water surface. How high (in degrees) is the Sun above the…
 updated one year ago
 1 reply
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masha2204:
You know that the energy of ionization of lithium is 5.4 eV and helium – 25 eV. Compute the wavelengths necessary to ionize these atoms. Whi…
 updated one year ago
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masha2204:
A laser ray hits the surface of water at the angle of incidence 35o.Whataredirec tions of the reflected and refracted rays? Make a graph s…
 updated one year ago
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masha2204:
You know that the energy of ionization of lithium is 5.4 eV and helium – 25 eV. Compute the wavelengths necessary to ionize these atoms. Whi…
 updated one year ago
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masha2204:
What are the energies of the waves used by your GSM cellphone?They can have frequency of 900 MHz or 1800 MHz. How many times is their energy…
 updated one year ago
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masha2204:
WhataretheenergiesofthewavesusedbyyourGSMcellphone?Theycanhave frequency of 900 MHz or 1800 MHz. How many times is their energy smaller than…
 updated one year ago
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masha2204:
How many times is the blue light (blue photons) more energetic than the red light (red photons)?
 updated one year ago
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masha2204:
How many times is the blue light (blue photons) more energetic than the red light (red photons)?
 updated one year ago
 3 replies
 1 Medal

masha2204:
You know that the energy of ionization of the hydrogen is 13.6 eV. Compute the wavelength of light which can ionize an atom of hydrogen.
 updated one year ago
 1 reply
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masha2204:
solve each system by substitution 7x+2y=19 x+2y=21
 updated one year ago
 12 replies
 1 Medal