What is the beat frequency of two sounds that have equal amplitudes and frequencies of and 444. Hz?
What will be an ideal response?
4. Hz
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The general heliocentric model proposed by Copernicus was appealing, and eventually became preferred, because
A. it explained why we do not observe stellar parallax. B. it was more aesthetically pleasing than the complicated Ptolemaic model. C. it made more accurate predictions than the Ptolemaic model. D. it replaced Earth with the Sun as the center of the solar system.
The heat capacity of object B is twice that of object A. Initially A is at 300 K and B is at 450 K. They are placed in thermal contact and the combination is isolated. The final temperature of both objects is:
A. 200 K B. 300 K C. 400 K D. 450 K E. 600 K
According to the Big Bang model, in the earlier state of the Universe gamma rays converted into ________.
A. hydrogen and helium B. pairs of matter and antimatter C. pairs of protons and neutrons D. X-rays
Tides are caused because different parts of the earth's oceans are at different distances from the moon
Indicate whether the statement is true or false