Why do sunspots occur darker than the rest of the Sun's surface?
What will be an ideal response?
Sunspots are cooler than the photosphere with a temperature of about 4200 K. The photosphere has a temperature of about 5800 K. Because the total amount of energy radiated by a surface depends on its temperature raised to the fourth power, sunspots look dark in comparison.
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Scientific Notation: What is the result of the calculation (0.410 + 0.021) × (2.20 × 103)?
A. 880 B. 946 C. 948 D. 950
Who suggested that material particles (protons, etc.) have wave properties too?
A) Bohr B) Einstein C) Planck D) Schrodinger E) de Broglie
Because of refraction, the Sun near sunset appears
A) higher in the sky. B) lower in the sky. C) farther away.
A positive charge Q is located at the center of an imaginary Gaussian cube of sides a. The flux of the electric field through the surface of the cube is ?. A second, negative charge -Q is placed next to Q inside the cube
Which of the following statements will be true in this case? A) The net electric field on the surface of the cube is equal to zero B) The electric field on the surface of the cube is perpendicular to the surface C) The magnitude of the net electric field is constant on the entire surface of the cube D) The net flux through the surface of the cube is equal to zero E) The net flux through the surface is equal to 2?