Photon has no rest mass but when photon travels at the speed of light, it gains momentum.
The energy of the photon is E= pc, c = speed of the photon and p= its momentum.
∴ E = pc
but p = h/λ (This comes from De-broglie's theory)
∴ E = hc/λ
frequency = ν = c/λ
∴E = hν
That's a pretty good intuitive definition of a <em>theory </em>.
Answer:
Explanation:
The amount of force needed needs to be greater than all the forces acting in the opposite direction that the bowling ball was thrown. This includes air resistance, floor friction, gravity, and any other force involved. As long as the force acting on the bowling ball that is causing it to go in the direction of the pins is slightly greater than the opposite acting forces then it will continue in that direction. Since no values are provided we cannot calculate the actual precise value of force needed.
Answer:
D Any of the above depending on the directions of forces.
Explanation:
The net force on the box depends on the direction of the forces.
For example, we have three special cases:
- If the two forces are in the same direction, they add to each other, so the net force is
F = 10 N + 10 N = 20 N
- If the two forces are in opposite directions, the net force is given by the difference between the two forces, so
F = 10 N - 10 N = 0 N
- If the two forces are perpendicular to each other, their resultant is given by the Pythagorean theorem:

If the two forces are at any other angle, their resultant can be found by resolving each force along the x- and y- direction, and adding the components along each direction. The resultant net force will have a magnitude between 0 N and 20 N.
V = IR
I = V/R
I = 12/6
I = 2 amps