1)The shovel changes the direction of the force the man applies.2)The man can apply less force.3)<span>The force applied by the end of the shovel increases.</span>
Answer:
L=2*10^-10m
Explanation:
we need to evaluate for a minimum energy:
Planck constant= h = 6,62607015 ×10 -34 kg⋅m2⋅s−1
1.5*10^-18J = 10eV
En= n^2h^2 / 8mL^2
for n=1 (minimum energy)
E1= h^2 / 8mL^2
so...
L^2= h^2/(8mE1)
L^2= (6.63*10^-34)^2 / [ 8(9.11*10^-31 )*(1.5*10^-18J )]
L^2= 4.02*10^-20
L= 2*10^-10 m
The question is incomplete,so the complete question is as follows:
According to Einstein, increasing the brightness (or intensity) of a beam of light without changing its color will increase (circle all that apply):
A) the number of photons per second traveling in the beam.
B) the energy of each photon.
C) the speed of the photons.
D) the frequency of the light.
E) the wavelength of the photons
Answer:
A)
Explanation:
According to Einstein, an increase in the intensity or brightness of light beam will increase the number of photons over a given time interval.
It means that the energy emitted will depend on the energy of individual photon rather than the intensity of the incoming light.
Hence, the correct option is "A)"