Pulsars slow their pulse rate because:
a. they convert energy of rotation into radiation.
b. they drag companion stars around, causing them to slow.
c. of friction with the interstellar medium.
d. of the conservation of angular momentum.
Answer is a. they convert energy of rotation into radiation.
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In the four radioactive series, the nuclei decay by either emitting alpha particles or beta particles until they reach the stable end product. Each decay, therefore, results in a mass number change of either 4 (for alpha decay) or 0 (for beta decay). The radium isotope 226Ra is in one of these series. What is the starting isotope in the series containing 226Ra?
a. 238U b. 235U c. 232Th d. 237Np
What do we learn by studying chondrites?
a. Earth's early composition b. the history of comets from the Oort cloud c. the different formations of the Terrestrial and Jovian planets d. the steps in planetary differentiation e. the conditions and processes from the early days of the solar nebula
If a = 3.0 mm, b = 4.0 mm, Q1 = 60 nC, Q2 = ?80 nC, and q = 36 nC in the figure, what is the magnitude of the electric force on q?
a.
5.0 N
b.
4.4 N
c.
3.8 N
d.
5.7 N
e.
0.60 N
In an energy level transition from the n = 2 state to the n =1 state for a hydrogen atom a photon will be emitted
Indicate whether the statement is true or false