Question

can you explaination for thes questions how did we got these right answers. Thankyou!

w many photons of light with frequency 5.50 x 1015 Hz are required to provide 1 kJ of energy? 3364 x 10-18 2. What is the wavelength of a bullet that is 0.450 g traveling at 2000. m/s? A) 2000 nm B) 2.74 x 1020 C) 4.56 x 10 D) 1.65x 10 E)3.84x 10 B) 2/94 x 10-24 m C) 7.36 x 104 m D) 7.36 x 103 m 3. How many electrons in a bromine atom have an angular momentum quantum number, L, equal to 0? 2 B) 8 C) 7 D) 17 4. What is the total number of orbitals possible with n 3? B) 16 C) 32 5. Determine ArtH for the decomposition of hydrogen peroxide. g)+Ho0 Given: H2(g)+O2(g)- HO) ArH-187.78 A) -98.05 kJ/mol B) 93.89 kJ/mol C)-191.94 kJ/mol D)-9389 kJlmol 6. For a hydrogen atom, which electronic transition would result in the emission of a photon with the highest energy? D) 71- 5d B) 2p 6d C) 6p 7. The possible value(s) of the orbital angular momentum quantum number of a 3p electron C) 0 B)-1, 0, +1 8. Identify the type of orbital that has five radial nodes and zero angular nodes? A) 4d D) C) 5p B) 5s uranium-235 will effuse through the same hole, at the same temperature and in the same amount of time? 4.77 x 10-5 mol 9. If 4.800 x 10-5 mol of uranium-238 at 4500 K effuses through a hole in 125 seconds, how many mal of c) 4.80 x 10-5 mol A) 4.74 x 10-5 mol D) 4.86 x 10-5 mol E)4.83 x 10-5 mol of an elec 10. The fact that we cannot simultaneously measure the exact position and precise momentum is referred to as: B)Hund's Rule A) Pauli Exclusion Principle C) The DeBroglie Relationship )FHeisenberg Uncertainty Principle

Answer 1

Ans 1 : B) 2.74 x 10²⁰

Energy of one photon is given as :

E = h x f

h is planck's constant = 6.626 x 10^-34 J.s

f = frequency = 5.50 x 10¹⁵ Hz

putting values :

= 6.626 x 10^-34 J.s x 5.50 x 10¹⁵ Hz

= 3.64 x 10^-18 J

total energy = 1 KJ = 1000 J

So number of photons :

= 1000 J / ( 3.64 x 10^-18 J/photon)

= 2.74 x 10²⁰ photons