Question
7. True or false. (a) Max Planck assumed that energy can be emitted of light from hot objects. Answer: (b) Photons are emitted at discrete wavelengths in line spectra. Answer: in discrete amounts based on the results from the emission (c) Even though energy is discrete, we don't see it in the macroscopic world because the P very small number. Answer: (d) According to Heisenberg, it is impossible to know simultaneously both the exact momentum of the electron and its exact location in space. Answer: (e) Electromagnetic radiations with different energy have the same effect on matter. Answer: () According to Born, taking the square of y would give the probability of finding the electron in a certain region of space at a given time. Answer: (g) Bohr postulated that when an electron changes from the higher energy state to the lower energy state, electromagnetic radiation is released. Answer: (h) The magnetic quantum number describes the orientation of the orbital in space. Answer: (i) The principle quantum number describes the energy of the orbital. Answer: G) The angular momentum quantum number describes the shape of the orbital. Answer: (k) Valence electrons are the core electrons used to form chemical bonds. Answer: (1) All p orbitals with different principle quantum number are spherical with the same size. Answer: (m) For all s orbitals, electrons can be only found in the lobes. Answer: (n) The 3p, orbital is oriented along the z-axis. Answer: (o) The 3p, orbital is smaller than the 4p orbital. Answer: (p) All s orbitals are dumbbell-shaped. Answer:
Explanation / Answer
Ans 7
a) false
This was suggested by Albert Einstein and not Max Planck , for which the former received nobel prize.
b) False
The photon has a continious wavelength and not discrete enrgy levels.
c) True
Planck's constant is very small , its value is 6.63 x 10-34 m2 kg/s
d) True
the heisenberg's principle is also called as heisenberg's uncertainity principle which states that the exact position and momentum of the object cannot be known simultaneously.