42 = 4µC 50ст 4 =-7µC 93 = 3µC 10ст
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- Show that ?⃑ = [1,12, −29] can be written as a linear combination of ?⃗⃑ = [3,1,4] and ?⃑ = [1,2, −3]4. From van der Waals equation, using (2²) ₁ = =0= (OVD), T a = ² - RT₁Vmc Show that and Tc b 8a 27Rb Vmc 3 5. Show that the Lennard-Jones energy -(1) a Pc = 27b²² ----(ii) has a minimum value equal to - e at r = 2¹/6σ. Vmc = 3b 12 U₁, (r) = 4€ [(-) ¹² - ()]Explain the physics behind the fourth assumption in Bohr's atomic model, i.e., mevr-nh/2, where me and v are the mass and velocity of electron around the nucleus, respectively, r is the radius of an allowed orbit, n is an integer and h is the Plank constant.
- 9. Look up the values of the quantities in ag =- 4x²mekq? m - and verify that the Bohr radius ap is 0.529x10-10 mF= k 1, n Y(m) electan 8.98 x10? %3D 1.6 X1U c) ro [S-21x16-" X(m) proten' = + 1.6 x15c to the magnitude g He forcel CalculeteQuestion 9 The HVL for lead atomic number 82 of attenuation 0.1 is 69.3 6.930 0.693 0.0693
- If you are shining light on a Pt electrode and no electrons are emitted, what do you have to do to generate electrons? Decrease the wavelength of the light to increase the energy of the photons to emit electrons Electrons can not be emitted from Pt because like any other noble metal it does not react, even under light exposure (unlike other metals, e.g. Na, Sr or Cu) Increase the wavelength of the light to increase the energy of the photons to emit electrons Wait longer times or increase the intensity of the light source, since the energy of the absorbed light is not high enough to emit electrons from Pt surface7. A mass of 150 g of a element is known to contain approximately 4.52 x 1024 atoms. What is the element? f60 s Fluorine Silicon 160 ssfo Phosphorus Nitrogen Sodium Sulfur Carbon sto Magnesium ssf60 ssf60 ssfó0 ss Neon Aluminum Oxygen ssf60 ssf60 ssf60 ssf60 ssf60 ssf60 ssfó0 ssf 160 s060- ssf60 ssf60 ssfo0 ssf60 o ssf60 ssf60 ssf60 ssf60 ssf60 ssf60 ssio 60 ssf60 ssf60 ssf60 ssf60 ssf60 s ssf60 ssf60 ssf60what element has 3 protons, 2 electrons, and 3 neutrons and what is its symbol?