The image of x-ray emission uses different colors to represent different levels of brightness. The dark blue color represents the least bright x-ray emission. Which color represents the brightest x-ray emission?

What will be an ideal response?


White

Physics & Space Science

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Consider a situation where two moving objects collide and rebound from each other. Which of the following is not an example of potential energy?

a. The energy stored in a pile driver. b. The energy stored in a stretched spring. c. The energy of a body moving across a horizontal surface. d. The energy in the water at the top of a waterfall.

Physics & Space Science

For a system undergoing an isothermal expansion, the work done on the working fluid is:

A. May be either, depending on the temperature B. Positive C. Zero D. Negative

Physics & Space Science

Gravity acts over a limited distance range

a. True b. False Indicate whether the statement is true or false

Physics & Space Science

Which of the following best describes the origin of ocean tides on Earth?

A) Tides are caused by the difference in the force of gravity exerted by the Moon across the sphere of the earth. B) The Moon's gravity pulls harder on water than on land, because water is less dense than rock. C) Tides are caused by the 23 1/2° tilt of the earth's rotational axis to the ecliptic plane. D) Tides are caused primarily by the gravitational force of the Sun. E) Tides are caused on the side of Earth nearest the Moon because the Moon's gravity attracts the water.

Physics & Space Science