What direct evidence do we have that the weak and electromagnetic forces were once unified as a single electroweak force?

A) The most advanced telescopes are able to see back to this era in the universe.
B) Detectors on Earth have received photons and high-energy particles from this era.
C) Temperatures in the center of the Sun can reproduce the conditions during this era.
D) Particle accelerators on Earth can recreate the conditions of this era and have produced particles predicted by the electroweak theory.
E) We have no direct evidence of the electroweak force.


D) Particle accelerators on Earth can recreate the conditions of this era and have produced particles predicted by the electroweak theory.

Physics & Space Science

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Alpha decay occurs in some radioactive nuclides with A > 150. The probability of an alpha particle being emitted depends on the energy of the alpha particle. Why is this so?

a. Wave functions for the alpha particle must decrease to zero when the strong force potential goes to zero. b. Alpha particles must pass through classically forbidden regions with high potential barriers. c. The Coulomb potential for the alpha particle depends on the energy of the alpha particle. d. To emit the alpha particle, the nucleus must be hit by a gamma ray that has energy inversely proportional to the probability it will strike the nucleus.

Physics & Space Science

The expansion of a star to giant or supergiant size _____, and so the stars move toward the upper right in the Hertzsprung-Russell (H-R) diagram

A) contracts the star drastically B) cools the star's outer layers C) dims the star D) makes the star less luminous

Physics & Space Science

The coefficient of kinetic friction between the surface and the larger block is 0.25, and the coefficient of kinetic friction between the surface and the smaller block is 0.40. If F = 22 N and M = 1.0 kg in the figure, what is the magnitude of the acceleration of either block? ? ?

A. 1.8 m/s2 B. 2.6 m/s2 C. 1.4 m/s2 D. 2.2 m/s2 E. 3.7 m/s2

Physics & Space Science

Triple the mass of the bob on a simple pendulum will cause a change in the frequency of the pendulum swing by what factor?

a. 1/3 b. 1 c. 32 d. 3 e. 1/32

Physics & Space Science