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
A brain!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!
Answer:
B. 8
Explanation:
because I learned that in 6th
Answer:
False.
Explanation:
The chemical hazard label with colors indicates the specific class of hazard. Hazardous Materials Identification System is defined as the numerical hazard rating then incorporate the use of labels with colors.
Blue color: This sign conveys the health hazards of the material, means that long-term exposure to the material can cause the problems, for example kidney damage, and emphysema.
Red for color: This sign conveys the flammability hazards of the material.
Yellow for color: This sign conveys the instability hazards of the material.
Answer:
Density = 
Explanation:
Given that,
Mass of the object, m = 1000 g
Volume of the block, V = 50 cm³
We need to find the density of the object. Density is equal to mass per unit volume.
d = m/V
So, the density of the object is .
