Light with a wavelength of 5.0 · 10-7 m strikes a surface that requires 2.0 ev to eject an electron. Calculate the energy, in joules, of one incident photon at this frequency. joules

4.0 x 10 -19
9.9 x 10 -32
1.1 x 10 -48
4.0 x 10 -49

They are: -14 joules.

And the other answer is: 9.9 x 10-32.

Explanation:

Since to convert to joules it is necessary to add 4 with 9 decimal places to the first number and to the second number 25 decimal places are added.

--- Since 5.0 plus 4 and 9 decimals is: 9.9

--- As 10 - 7 plus 25 decimals: 10 - 32

--- And 9.9 in joules is 8.0 x 10 - 32 = - 22 and 8.0 x -22 is - 14. So they are - 14 joules.

--- And the other answer is: 9.9 x 10- 32

I hope I have helped.

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me