an implosion
an endothermic process
a phase change
(please explain! Do not jus give me the answer... I know its not B or
d.
Answer:
C. law of conservation
Explanation:
Observation B: Photoelectrons with a kinetic energy of 155 kJ/mol were observed
Observation C: Photoelectrons with a kinetic energy of 51 kJ/mol were observed
Which observation corresponds to which wavelength of light?
Answer:
A. No photoelectrons < C. KE = 51 kJ·mol⁻¹ < B. KE = 155 kJ·mol⁻¹
632 nm < 455 nm < 325 nm
Explanation:
The equation for the photoelectric effect is
E = hf = Φ + KE
That is, the energy (hf) of the incident photon is used to eject an electron from the surface of the metal ( the work function, Φ), and anything left over goes into the kinetic energy (KE) of the electron.
1. Calculate the relative energies of the three wavelengths
E = hf
fλ = c or f = c/λ. So,
E = (hc)/λ
The energy is inversely proportional to the wavelength. Thus, the order of increasing energies is
632 nm < 455 nm < 325 nm
2. Assign the radiation to the observations.
Solve the photoelectric equation for KE.
E = Φ + KE
KE = E - Φ
If E < Φ, the light does not have enough energy to eject a photoelectron.
Once E > φ, the greater the value of E, the greater the value of KE.
The order of energies is
A. No photoelectrons < C. KE = 51 kJ·mol⁻¹ < B. KE = 155 kJ·mol⁻¹
632 nm < 455 nm < 325 nm
Observation A corresponds to the 325 nm wavelength, observation B corresponds to the 632 nm wavelength, and observation C corresponds to the 455 nm wavelength.
The observation labeled A corresponds to the 325 nm wavelength, observation B corresponds to the 632 nm wavelength, and observation C corresponds to the 455 nm wavelength. This is because the behavior of photoelectric effect can be explained by Einstein's equation, E = hf, where E is the energy of a photon, h is Planck's constant, and f is the frequency of the light. Since frequency and wavelength are inversely proportional, higher frequency light corresponds to shorter wavelength and vice versa.
#SPJ3
when the substances are chemically reacted the physical properties remain the same
each substance has a unique set of physical properties
no two substances have any of the same properties
The following statements apply:
1. At any given location, the physical properties of a substance do not change.
2. Each substance has a unique set of physical properties.
Each substance usually has some characteristics that are peculiar to it and these characteristics can be used to identify them and separate them from other materials. Change of location does not affect the properties of substances, thus, the properties of oxygen that is found in America is the same as the one that is found in Nigeria.