Aphoton of ultraviolet (uv) light possesses enough energy to mutate a strand of human dna. what is the energy of a single uv photon and a mole of uv photons having a wavelength of 25 nm?

Energy of single uv photon= 7.95 x 10⁻¹⁸ J

Energy of a mole of photons=4788213 J

Explanation:

the energy of a photon is given by

h= planck's constant=6.626 x 10⁻³⁴ Js

λ= wavelength=25 nm= 25 x 10⁻⁹ m

c= velocity of light= 3 x 10⁸ m/s

so

E=7.95 x 10⁻¹⁸ J

so energy of one photon=7.95 x 10⁻¹⁸ J

Energy of one mole of photons= 6.022 x 10²³ (7.95 x 10⁻¹⁸ J)

Energy of one mole of photons=4788213 J

the force on the thing and the distance the force moves the thing

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27