Answer:
i) photons, they collide with the electrons
ii)when the energy of the photons is less than the work function there is no way to get out electrons
iii) he energy depends on the frequency in this Planck postulate
Explanation:
This exercise the photo cell is used for the photoelectric effect, this effect was explained by Einstein
i) Where the light is supposed to act as a particular, therefore, it is called photons, they collide with the electrons and they can tear off the metal, with a collision it is very fast there is no measurable wait in the process.
ii) since we have a shock process, the equation must be fulfilled
K = h f - Ф
where E = h f is the energy postulated by Plank and Ф the work function of the metal, therefore when the energy of the photons is less than the work function there is no way to get out electrons, which determines a threshold energy in the process
iii) From the same previous equation, the energy depends on the frequency in this Planck postulate, and not on the intensity squared as accepted in classical mechanics.
Answer:
15 nC and 10 nC
Explanation:
qA + qB = 25 nC = 25 x 10^-9 C
F = 5.4 x 10^-4 N
d = 5 cm = 0.05 m
Use the Coulomb's law
By substituting the values, we get
qA x qB = 1.5 x 10^-16 C
So, 
qA = 15nC or 10nC
So, qB = 10 nC or 15 nC
Answer:
All of the above
Explanation:
The steps that should be taken for rating the results is as follows
1. Pin location checking
2. Offical website checking for the address purpose
3. The checking should be done for the closer results in the case of non-returning
Therefore all of the above steps are required and taken for rating the results
Hence, the same is to be considered
Answer:
c. The roller coaster is in uniform circular motion
Explanation:
Since the loop is circular with radius r, and its instantaneous speed, v is always constant, and also, its centripetal acceleration, a' = v²/r.
Since the angular speed, ω = v/r does not change, the magnitude of its tangential acceleration is zero although there is a change in its direction because the direction of its initial velocity changes. That is a" = rα and α = Δω/Δt since Δω = 0, α = 0 and a" = r(0) = 0
So, there is no tangential acceleration. Since there is no tangential acceleration, our instantaneous acceleration which is the vector sum of our centripetal acceleration and tangential acceleration is a = √(a'² + a"²) = √(a'² + 0²) = √a'² = a' = v²/r
So, a is always v²/r.
Since the instantaneous acceleration is always (a = v²/r) constant, the motion is uniform. So, it is uniform circular motion.
Explanation:
Molybdenum is a chemical element. It is denoted by Mo. In this problem, we need to match the phrases with their corresponding values using periodic table.
Atomic no = 42
Atomic mass = 95.94 amu or 96
No of valance electrons = The elctronic configration of Molybdenum is [Kr] 4d⁵ 5s¹. It means there is 1 valance electron in it.
No of electrons in the n = 3 shell = 18
No of neutrons = 54
