Distance is a(n) ______________ quantity
Fill in the blank(s) with correct word
scalar
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A parallel plate capacitor with an air dielectric is attached to a voltage source and charged. The voltage source is removed, and then the plates are separated to double their previous distance. What happens to the energy stored by the capacitor when the plates are separated?
A. it doubles B. it quadruples C. it halves D. it is diminished by a factor of 4 E. it stays the same
Why is the sky blue (on Earth)?
A) because the Sun emits mostly blue light B) because molecules scatter red light more effectively than blue light C) because deep space is blue in color D) because molecules scatter blue light more effectively than red light E) No one knows—this is one of the great mysteries of science.
People of central Africa predicted the weather by
A) recording the seasonal changes in average temperature. B) observing the location of the Moon relative to the Sun in the sky. C) observing the path of the planets across the sky. D) observing the orientation of the crescent moon relative to the horizon. E) observing the length of the lunar cycle.
A photon of energy E0 strikes a free electron, with the scattered photon of energy E moving in the direction opposite that of the incident photon. In this Compton effect interaction, the resulting kinetic energy of the electron is
1. E0 2. E 3. E0 – E 4. E0 + E