Ultraviolet radiation from a star
a. will not penetrate Earth's atmosphere and reach the ground.
b. has a wavelength that is longer than the visible light emitted by the star.
c. has a wavelength that is shorter than the x-rays emitted by the star.
d. a and b
e. b and c
A
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Which of the following is not a result of cross-linking polymer chains?
(a) Increased hardness (b) Increased melting temperature (c) Decreased plastic deformation (d) Increased brittleness
Which of the following is not a SI base unit?
A. kelvin B. kilogram C. newton D. second E. meter
In the context of the Doppler effect, which of the following is a difference between a blueshift and a redshift?
A) Unlike a redshift, a blueshift is caused by a velocity of recession. B) Unlike a blueshift, a redshift is based on the Hubble's law. C) Unlike a redshift, a blueshift is a shift toward shorter wavelengths. D) Unlike a blueshift, a redshift is based on a light source moving closer to an object.
An 8000 kg satellite is launched from the surface of the earth, and injected into a circular orbit at an altitude of 100 km above the surface of the earth. The gravitational potential energy of the satellite in the circular orbit is 
A. 
B. 
C. 
D. 
E. 