- Calculate the energy in joules of a photon of red light that has a frequency of 4.0x10^14 hz?

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Why the carbon electrode is used in atomic bomb?why other electrode are not used? Bus moving at a speed of 20 m/s begins to slow down at a constant rate of 3m/s each second find how far it goes before stopping? Chemistry help on exothermic and enthothermic questions anyone? Help, double integrals, I cant get answer:
∫[from 0 to infinity] (tan−1(5x)−tan−1(2x))/(x) dx. I got:
∫[from 2 to 5] (1/(1+(xy)^2)) dy.? How do I write out: minus I-H-R-D sine D-T equals minus D squared psi D-X squared plus V of X?