In summary, gravity is the force that creates the pressure to fuse atoms, which makes the stars shine. Eventually the temperature is high enough that the star starts fusing hydrogen into helium. When the outward pressure produced by the heating of the gas by fusion energy balances gravity, a stable star is formed.
There are an estimated 100 billion, so the answer would be D.) Billions
Answer:
The wavelength of next line in the series will be 397.05 nm
Explanation:
From Rydberg equation;
where;
λ is the wavelength
n lines in the series
RH is Rydberg constant = 1.097 x 10⁷ m⁻¹
Also at a given maximum wavelength, we can determine the first line n₁ in the series
Given;
maximum wavelength = 656.46 nm
Now, test for different values of n that will be equal to 7.2
let n₁ = 1
n₁(1) ≠ 7.2
Again, let n₁ = 2
∴ n₁(2) = 7.2
For the least wavelength given as 410.29 nm, n = ?
next line in the series will be 7
The wavelength of next line in the series will be;
Therefore, the wavelength of next line in the series will be 397.05 nm
The first factor is wind speed, the second factor is wind duration, and the last factor is the fetch, the distance over which the wind blows without a change in direction.
all these factors determines the strength of a wave.
hope this helps :)
Answer:
No ejection of photo electron takes place.
Explanation:
When a photon of suitable energy falls on cathode, then the photoelectrons is emitted from the cathode. This phenomenon is called photo electric effect.
The minimum energy required to just eject an electron is called work function.
The photo electric equation is
E = W + KE
where, E is the incident energy, W is the work function and KE is the kinetic energy.
W = h f
where. h is the Plank's constant and f is the threshold frequency.
Now, when the violet light is falling, no electrons is ejected. When the red light is falling, whose frequency is less than the violet light, then again no photo electron is ejected from the metal surface.
