Why couldn't electrons bind to nuclei when the nuclei first formed?

A) electrons exert the strong force on the nuclei and repel it
B) universe was much too hot
C) universe was much too cold
D) electrons exert the weak force on the nuclei and repel it
E) electrons have negative charge and repel the nuclei


Answer: B) universe was much too hot

Physics & Space Science

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Describe the evidence that best supports the Milankovitch hypothesis

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Two masses are suspended by cord that passes over a pulley with negligible mass. The cord also has negligible mass. One of the masses, has a mass of 6.0 kg and the other mass, has a mass of 4.0 kg. The force of the cord attached to is



A. 47 N upward.
B. 47 N downward.
C. 33 N upward.
D. 33 N downward.
E. 15 N upward.

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In order to produce a hologram, one needs, in addition to an object and a piece of photographic film,

A) a beam of monochromatic light and a mirror. B) a beam of coherent light and a lens. C) a beam of monochromatic light and a lens. D) a beam of coherent light and a mirror.

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The potential difference between two square parallel plates is 4.00 V. If the plate separation is 6.00 cm and they each measure 1.5 m by 1.5 m, what is the magnitude of the electric field between the plates?

What will be an ideal response?

Physics & Space Science