Answer:
Minimum required frequency is υmin = 654.9 x 10¹² Hz
Explanation:
The energy of a photon is given by the equation:
E = hυ
where,
E = energy of photon
h = Plank's Constant = 6.626 x 10⁻³⁴ J.s
υ = frequency
The minimum energy of photon, must be equal to the work function of Calcium.
Emin = ∅₀ = h(υmin)
υmin = ∅₀/h
where,
υmin = minimum frequency
∅₀ = work function = 4.34 x 10⁻¹⁹ J
Therefore,
υmin = 4.34 x 10⁻¹⁹ J/6.625 x 10⁻³⁴ J.s
<u>υmin = 654.9 x 10¹² Hz</u>
Answer:
d. all four jovian planets.
Explanation:
The Jovian planets are as follows -
URANUS , SATURN , JUPITER, and NEPTUNE .
All these four jovian planets are having the rings , and the rings are made up of infinite number of small pieces of the ice and the rock .
Hence ,
These planets are comparatively small and dense cores surrounded by massive layers of gas .
Answer:
The hoop
Explanation:
We need to define the moment of inertia of the different objects, that is,
DISK:
HOOP:
SOLID SPHERE:
HOLLOW SPHERE
If we have the same acceleration for a Torque applied, then
The greatest momement of inertia is for the hoop, therefore will require the largest torque to give the same acceleration
