An atom that has more electrons than protons is a ______________ ion
a. neutral
b. positive
c. negative
d. polyatomic
c
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What is the potential difference Vb?Va shown in the circuit below.
A. ?8.0 V B. +8.0 V C. ?18 V D. +18 V E. ?12 V
Waves on a String: The speed of sound in steel is 5000 m/s. What is the wavelength of a sound wave of frequency 660 Hz in steel?
A. 7.58 m B. 2.41 m C. 1.21 m D. 0.829 m E. 0.132 m
Protostars initially do not experience hydrogen fusion. How does their temperature increase?
A. fusion of hydrogen into helium B. the light from nearby stars C. energy from their magnetic fields D. gravitational energy from infalling material
Relative to the comet, the direction of the ion tail tells us
A) the direction of the Sun. B) the direction the comet is traveling. C) where the ecliptic is. D) where the comet came from. E) the velocity of the comet.