What is the energy of an electromagnetic wave that has a frequency of 4.0 x 109 Hz? Use the equation E = hf, where h = 6.626 x 10-34 J·s.

True or false: the revolution of the earth creates day and night as it rotates around the sun

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Suppose a force of 60 n is required to stretch and hold a spring 0.1 m from its equilibrium position. a. assuming the spring obeys hooke's law, find the spring constant k. b. how much work is required to compress the spring 0.5 m from its equilibrium position? c. how much work is required to stretch the spring 0.6 m from its equilibrium position? d. how much additional work is required to stretch the spring 0.1 m if it has already been stretched 0.1 m from its equilibrium? a. kequals 600