The Himalayan Mountains are rugged, jagged peaks and the Appalachians are smooth and rolling. Why is there a difference?
a. The Himalayas are much older and the rocks have begun breaking off.
b. The Himalayas are volcanic mountains and the Appalachians are not.
c. The Appalachians are much older and have been smoothed by erosion.
d. The Appalachians are younger and just started to be thrust upward by plate tectonics.
e. a and d
c
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Unpolarized light is incident upon two polarization filters that do not have their transmission axes aligned. If of the light passes through this combination of filters, what is the angle between the transmission axes of the filters?
A) 53° B) 73° C) 85° D) 80°
An electron has a speed of 0.783c. Through what potential difference would the electron need to be accelerated from rest in order to reach this speed? The rest mass energy of an electron is 0.511 MeV
A) 310 kV B) 260 kV C) 360 kV D) 400 kV
The study of the oscillations of the surface and interior of the sun is known as ____________________
Fill in the blank(s) with correct word
If we say that a galaxy has a lookback time of 1 billion years, we mean that
A) its light traveled through space for 1 billion years to reach us. B) it is now 1 billion light-years away. C) it was 1 billion light-years away when the light left the galaxy. D) it is 400 million years old.