Answer is B hope this helps
Answer:
1. 
and 
2.
Explanation:
The energy of a photon is given by the so-called Planck-Einstein relation:
where E is the energy, f the frequency, 
the wavelength, c the speed of light and h the planck constant
So, we have:
And:
2. The work function is the amount of energy required to remove an electron from the material. Therefore the kinetic energy of the photoelectrons will be the energy of the electromagnetic radiation minus the work function:
Where K is the kinetic energy and W the work function, for copper W=4.7eV
Rewriting for :
This wavelength corresponds to the ultraviolet range
Answer:
C. a quantity with magnitude and direction
Explanation:
These are the options for the question
A. a quantity of magnitude only
B. a quantity with direction only
C. a quantity with magnitude and direction
D. a quantity with no units.
Velocity is the distance cover per time, it is the rate at which an object change its position with respect to time.
Velocity is a vector quantity unlike speed which is a scalar quantity, velocity is the speed of an object with a specific direction.
For instance, the distance cover by Mr. A is 10m, at 2 seconds, this show a magnitude and direction, then velocity here is 10/2=5m/s
No they are falling the same distance and the weight doesn't matter. Neither does the mass and matter. It just depends on the height in which they are falling at the same amount of time.
Hoped I helped!
