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: touch the pan to the burner
Explanation:
There are three modes of heat transfer:
conduction, convection and radiation.
For conduction, the heat transfers from a hot object to a cold object when the two are in contact.
For convection there is bulk motion of fluid occurs which transfers the heat.
For heat transfer by radiation, medium is not required.
Thus, to demonstrate conduction between pan and burner, the pan must touch the burner.
Answer:
you need to multiply the momentum and the mass
You may confuse two minerals by their colors so using streak is another way for showing their "true colors "
