A non-conducting sphere of radius R = 7.0 cm carries a charge Q = 4.0 mC distributed uniformly throughout its volume. At what distance, measured from the center of the sphere, does the electric field reach a value equal to half its maximum value?
A) 3.5 cm only
B) 4.9 cm only
C) 3.5 cm and 9.9 cm
D) 3.5 cm and 4.9 cm
E) 9.9 cm only
C
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____ is absorbed by ozone in Earth's atmosphere that is located between 20 km and 40 km above Earth's surface. Therefore, telescopes to observe this radiation must be placed in space
a. Infrared radiation b. Ultraviolet radiation c. Radio wave radiation d. X-ray radiation e. Visible light
If an extrasolar planet suddenly became more massive, but kept the same radius and orbit, what would change in the observed Doppler shift of the star?
A) The peak velocity of the star would be faster. B) The time between peaks in the velocity of the star would decrease. C) The time between peaks in the velocity of the star would increase. D) The shape of the velocity curve would become less symmetric. E) Nothing. The mass of a planet does not affect the Doppler shift.
Which of the following statements is not true about a neutralization reaction?
A) Water is always formed in a neutralization reaction. B) One molecule of acid neutralizes one molecule of base. C) A neutralization is the reaction of a hydroxide ion with a proton. D) All of the above are true. E) None of the above are true.
As you comb your hair, electrons are rubbed onto the comb, which becomes
A) negatively charged. B) positively charged. C) ionized.