Answer:
B. use light of a shorter wavelength.
Explanation:
We know that

h= plank's constant
c= speed of light
λ= wavelength of the incident light
so, in order to have sufficient energy for for the emission of electron, the incident's radiation must have λ small enough.
B. use light of a shorter wavelength.
Answer:
I think it may be decreased, but i'm in 6th grade so-
Explanation:
Answer:
I think the correct answer is period
The average speed is 8 miles