What is the distance between nodes?
A. wavelength/4
B. wavelength/3
C. wavelength/2
D. wavelength/1
C. wavelength/2
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You are moving past the Earth at 0.990c and notice your heart beating 88 beats per minute
(a) If a doctor on Earth measures your heart rate as you zip past, what will the measured rate be? (b) If you had been moving 99.99% the speed of light, what rate would you have observed your heart beats?
When a neutron decays to create a proton, another particle emitted is a(n)
a. alpha particle b. beta particle c. gamma ray d. x ray e. none of the above
If a substance is radioactive it is definitely
a. dangerous b. emitting alpha particles c. glowing d. useful e. all of the above f. none of the above Indicate whether the statement is true or false
Which of the following hypothetical discovery would be most surprising given our current theory of how stars and planets are born?
A) a star system with 7 planets, 2 of which rotate in a direction opposite to their orbital directions B) a star system with 5 planets, each orbiting in a different plane and in different directions C) a star system with a disk of gas but no planets D) a star system with 9 planets, in which 6 of the planets have no moons