The number of protons in a nucleus is the
a. mass number
b. neutron number
c. atomic number
d. isotope number
e. none of the above
C
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Earth has been gradually warming over the past few decades. Based on a great deal of evidence, scientists believe that this warming is caused by
A) the increase in forest fires during recent years. B) human activities that are increasing the concentration of greenhouse gases in Earth's atmosphere. C) the human release of chemicals called CFCs into the stratosphere. D) the fact that our politicians spout a lot of hot air.
A mass is pressed against (but is not attached to) an ideal horizontal spring on a frictionless horizontal surface. After being released from rest, the mass acquires a maximum speed v and a maximum kinetic energy K
If instead the mass initially compresses the spring twice as far: A) Its maximum speed will be 2v and its maximum kinetic energy will be 2K. B) Its maximum speed will be 2v and its maximum kinetic energy will be K. C) Its maximum speed will be v and its maximum kinetic energy will be 2K. D) Its maximum speed will be 2v and its maximum kinetic energy will be 4K. E) Its maximum speed will be 4v and its maximum kinetic energy will be 2K.
According to Einstein, events that are simultaneous in one frame of reference
A) are simultaneous in all frames of reference. B) are not simultaneous in other frames of reference. C) may or may not be simultaneous in other frames of reference.
A Young's interference experiment is conducted with violet argon laser light (? = 409 nm). The separation between the slits is 0.66 mm, and the interference pattern appears on a screen 3.8 m away. What is the spacing between the bright fringes? (1 nm = 10?9 m)
a. 1.5E–3 m b. 2.4E–3 m c. 1.5E+4 m d. 4.7E–3 m e. 1.6E–3 m