In the atom, which particles give the element its identity (atomic number)?
A) positrons
B) electrons
C) protons
D) neutrons
E) neutrinos
C
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The electron gun in a television tube accelerates electrons (mass = 9.11 × 10^?31 kg, charge = 1.60 × 10^?19 C) from rest to 3.00 × 10^7 m/s within a distance of 2.00 cm. What electric field is required?
An x-ray tube accelerates electrons through a potential difference of 50.0 kV. If an electron in the beam suddenly give up its kinetic energy in a collision,
what is the shortest wavelength x-ray it could produce? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, e = 1.60 × 10-19 C)
An object is placed 100 cm in front of a lens of focal length 20 cm. A second lens is placed 15 cm past the first lens. The second lens has a focal length of 40 cm. The final image
A) is real and upright. B) is virtual and upright. C) is real and inverted. D) is virtual and inverted. E) cannot be determined with the information given.
It is possible to decrease the entropy of a system locally without doing work on the system
What will be an ideal response?