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1. Wavelenght of the incident light

I was following one of the examples that my teacher did in class. well if i do 1.242 X 10^-6 / 6.15...it equals 2.01951 but the right answer is 201.7561 nm
2. Wavelenght of the incident light

i used h=4.14 X 10^ -15 am i supposed to use the other one? h=6.626 X 10^-34 ?
3. Wavelenght of the incident light

Homework Statement An incident light shines on a mercury metal plate with a work function of -4.5 eV. The stopping voltage is observed to be -1.65 volts. What is the wavelenght of the incident light? Homework Equations wavelength=hc/E-0(it's a Greek sign n i don't have it in my...
4. Lightning bolt electrons problem

A strong lightning bolt transfers about 25 C to Earth. How many electrons are transferred? 1 electrons = 1.60E-19 so.. 25 / 1.60 E -19 = 1.5625E-18 electrons but the answer that my teacher gave us is 1.6 E 20 electrons what did i do wrong?
5. Forces on a Box in a Moving Truck

well what about in a traffic light and when you hit the gas, the things in your car move backward, and when you hit the break that's when the things move forward
6. Forces on a Box in a Moving Truck

A box is sitting on the floor of a truck. The truck accelerates away from a stoplight. Which statement most accurately describes forces on the box. A) The box is pushed forward by the force of friction acting in the direction of motion of the truck. B)The engine of the truck pushes the box...
7. Formula for average force?

thank you so much guys!
8. Formula for average force?

delta p= J and J= F(delta t) so delta p=6.0g(350m/s) delta p=2100 2100/1.8=1166.6666667 is that the same thing as 1.2x10^3?
9. Formula for average force?

[SOLVED] Formula for average force? In a ballistics test at the police department, Officer Rios fires a 6.0 g bullet at 350 m/s into a container that stops it in 1.8 ms. What is the average force that stops the bullet? can anyone help me to do this? or just give me the formula? The teacher...