Answer:
Explanation: there are three types of fossil fuels which can all be used for energy provision; coal, oil and natural gas. Coal is a solid fossil fuel formed over millions of years by decay of land vegetation. When layers are compacted and heated over time, deposits are turned into coal.
Answer:
λ = 4.1638 10⁻⁷ m
Explanation:
The photoelectric effect was explained by Einstein assuming that the radiation acts like particles and the equation that describes the process is
K = h f -Ф
where K is the kinetic energy of the emitted electrons, hf the energy of the photons according to Planck's equation and Ф the work function of the material
In this case they give us the kinetic energy of the electrons
K = 0.7 eV
The sodium work function is tabulated Ф = 2.28 eV
Let's find the frequency of the photons
f = (K + Ф) / h
Planck's constant is
h = 6.626 10⁻³⁴ J s (1 eV / 1.6 10⁻¹⁹ J) = 4.136 10⁻¹⁵ eV s
f = (0.7 + 2.28) / 4.136 10⁻¹⁵
f = 7.2050 10¹⁴ Hz
let's find the wavelength using the relationship between speed and frequency and wavelength
c = λ f
λ = c / f
λ = 3 10⁸ / 7.205 10¹⁴
λ = 4.1638 10⁻⁷ m
Answer:
D
Explanation:
Telescopes detect electromagnetic waves from space and it travels back to the telescope lens in order for you to see.
The answer is D since to calculate acceleration is used the formula a = delta v over delta t where delta v is the final velocity 11m/s less initial velocity 0m/s so delta v is 11m/s and delta t is final velocity 10s less initial velocity that always will be 0 then 10 - 0 = 10 so a = 11 over 10 that is 1.1m/s^2 (remember that is squared)
Answer:
The density of the atmosphere varies in each layer as well as between each layer. The density is highest at the Earths surface and decreases as you go up.
As you go to surface it gets hotter and denser so the core would be densest and hottest and crust is the least of everything
Explanation:
im not sure if this answers your question but hopefully it can help