According to modern scientific dating techniques, approximately how long ago did Earth and the other planets of our solar system form?
A) 4.5 billion years
B) 10,000 years
C) 4.5 million years
D) 14 billion years
A) 4.5 billion years
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The Earth is about ___________ years old by ___________
a. 4 billion years old: radioactive dating b. 4 million; measuring Earth's orbital period around the Sun c. 4 billion; measuring Earth's orbital period around the Sun d. 4 million; radioactive dating
Answer the following statement(s) true (T) or false (F)
1. In the situation described in problem R4T.4, the train passengers are moving, but Rob is at rest. Therefore, the train passengers measure less time between the events than Rob does 2. The coordinate time between two given events is shortest in the inertial frame where their spatial separation is the smallest.
In 1974 we transmitted a message toward the globular cluster M13 which is 21,000 ly away. What is one reason that this object was probably not ideal for sending a message to?
A) it is so far away that we will probably have stopped communicating before we receive and return signal B) globular clusters contain young, high mass stars with insufficiently long main sequence lifetimes and hence are unsuitable places for life C) the message will be absorbed by interstellar dust before it reaches the cluster D) globular clusters contain, old, low mass stars with fewer heavy elements and hence are not ideal places for life
If y = 0.02 sin (30x ? 400t) (SI units), the frequency of the wave is
a. 30 Hz b. 15/? Hz c. 200/? Hz d. 400 Hz e. 800? Hz