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In hydrogen, the transition from level 2 to level 1 has a rest wavelength of 121.6 nm.


1).Find the speed for a star in which this line appears at wavelength 120.4 nm .


2).Find the direction for a star in which this line appears at wavelength 120.4 nm .


3).Find the speed for a star in which this line appears at wavelength 121.4 nm .


4).Find the direction for a star in which this line appears at wavelength 121.4 nm


5).Find the speed for a star in which this line appears at wavelength 122.2 nm .


6.Find the direction for a star in which this line appears at wavelength 122.2 nm


7).Find the speed for a star in which this line appears at wavelength 122.9 nm .


8).Find the direction for a star in which this line appears at wavelength 122.9 nm .

Answer :

matthewadeyinka10

Answer:

according to the Bohr'smodel,

The change in wavelength, Δλ = λ₁ - λ₂ = λ₂ν/c

where λ are the respective wavelengths

ν = speed of the stars/objects =?

c = speed of light = 3 x 10⁸m/s

1. To find the speed for a star in which this line appears at wavelength 120.4 nm.

i.e λ₁ = 120.4nm and λ₂ = 121.6nm

ν = [(120.4nm - 121.6nm)/121.6nm] x 3 x 10⁸m/s

ν = -2.71x10⁶m/s

2.  To find the speed for a star in which this line appears at wavelength 120.4 nm.

i.e λ₁ = 120.4nm and λ₂ = 121.6nm

ν = [(120.4nm - 121.6nm)/121.6nm] x 3 x 10⁸m/s

ν = -2.71x10⁶m/s

3. To find the speed for a star in which this line appears at wavelength 121.4 nm.

i.e λ₁ = 121.4nm and λ₂ = 121.6nm

ν = [(121.4nm - 121.6nm)/121.6nm] x 3 x 10⁸m/s

ν = -4.94x10⁵m/s

4. To find the speed for a star in which this line appears at wavelength 121.4 nm.

i.e λ₁ = 121.4nm and λ₂ = 121.6nm

ν = [(121.4nm - 121.6nm)/121.6nm] x 3 x 10⁸m/s

ν = -4.94x10⁵m/s

5. To find the speed for a star in which this line appears at wavelength 122.2 nm.

i.e λ₁ = 122.2nm and λ₂ = 121.6nm

ν = [(122.2nm - 121.6nm)/121.6nm] x 3 x 10⁸m/s

ν = 9.872x10⁵m/s

6. To find the speed for a star in which this line appears at wavelength 122.2 nm.

i.e λ₁ = 122.2nm and λ₂ = 121.6nm

ν = [(122.2nm - 121.6nm)/121.6nm] x 3 x 10⁸m/s

ν = 9.872x10⁵m/s

7. To find the speed for a star in which this line appears at wavelength 122.9 nm.

i.e λ₁ = 122.9nm and λ₂ = 121.6nm

ν = [(122.9nm - 121.6nm)/121.6nm] x 3 x 10⁸m/s

ν = 2.08x10⁵m/s

8. To find the speed for a star in which this line appears at wavelength 122.9 nm.

i.e λ₁ = 122.9nm and λ₂ = 121.6nm

ν = [(122.9nm - 121.6nm)/121.6nm] x 3 x 10⁸m/s

ν = 2.08x10⁵m/s

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