The energy delivered by the laser in 1 second is

In order to find how many photons correspond to this energy, we must calculate the energy of a single photon.
Calling h the Planck constant, c the speed of light and

the wavelength of the light, the energy of a single photon is given by

So, the number of photons emitted by the laser in 1 second is equal to the total energy delivered by the laser divided by the energy of a single photon:

photons
The answer to your question is,
Direction.
-Mabel <3
Answer:
d)
Explanation:
the only one that makes sense
To answer this question, we can use Newton's Second Law:
F = ma
We know that:
F = 20N
m = 0.25kg
So, we can plug what we know into the equation and isolate for the acceleration.
20 = 0.25a
a = 80m/s^2 which corresponds to answer A
Answer:
20.5
Explanation:
in this case, the two vectors are in the same direction, so they simply add:
total motion = 18m/s + 2.5m/s = 20.5m/s to the west