How can prolonged observations of pulsars yield their approximate age?
What will be an ideal response?
Unless being fed mass from a companion, the pulsars must eventually slow down as their magnetic fields impart spin energy outward in the form of the observed pulses; if the rate they are slowing down is carefully studied, it may tell us when they were spinning much faster, newly hatched from the supernova birth.
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A capacitor, in addition to storing charge, also stores electrical energy
Indicate whether the statement is true or false
The rate at which an object's velocity changes with time is called its
a. instantaneous velocity. b. motion. c. speed. d. acceleration.
If the relative mass of a hydrogen atom is 1/4 that of a helium atom, how many hydrogen atoms would you need to equal the mass of four helium atoms?
A) 16 B) 4 C) 1/4 D) 25 E) 6.022 × 1023
A thin lens has a focal length of 10.00 cm for red light. If the index of refraction for the lens material tends to decrease with increasing wavelength, what is the focal length of the lens for blue light?
a. also 10.00 cm b. less that 10.00 cm c. more than 10.00 cm d. It depends on whether the lens is converging or diverging.