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2 years ago

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

Physics

1 answer:

leonid [27]2 years ago

6 0

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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The temperature, T, of a gas is jointly proportional to the pressure P of the gas and the volume V occupied by the gas. Use C as

AnnZ [28]

Answer:

T=C*P*V

Explanation:

It is said that a variable - let's call 'y' -, is proportional to another - let's call it 'x' - if x and y are multiplicatively connected to a constant 'C'. It means that their product (x*y) can be always equaled to the constant 'C' or their division ( $\frac{x}{y}$ ) can be always equaled to 'C'. The first case is the case of the inverse proportionality: It is said that x and y are inversely proportional if

$x*y=C$

The second case is the case of the direct proportionality: It is said that x and y are directly proportional if

$\frac{x}{y} =C$ : x is directly proportional to y.

$\frac{y}{x} =C$ : y is directly proportional to x.

Always that any text does not specify about directly or inversely proportionality, it is assumed to mean directly automatically.

For our case, we are said that the temperature T is proportional to the pressure P and the volume V (we assume that it means directly); it is a double proportionality but follows the same rules:

If T were just proportional to P, we would have:

$\frac{T}{P} =C$

If T were just proportional to V, we would have:

$\frac{T}{V} =C$

As T is proportional to both P and V, the right equation is:

$\frac{T}{P*V}=C$

In order to isolate the temperature, let's multiply (P*V) at each side of the equation:

$\frac{T}{P*V}*(P*V)=C*(P*V)\\T=C*P*V$

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2 years ago

Modern wind turbines generate electricity from wind power. The large, massive blades have a large moment of inertia and carry a

horsena [70]

Answer:

a)106.48 x 10⁵ kg.m²

b)144.97 x 10⁵ kgm² s⁻¹

Explanation:

a)Given

m = 5500 kg

l = 44 m

Moment of inertia of one blade

$I$ = 1/3 x m l²

where m is mass of the blade

l is length of each blade.

Putting all the required values, moment of inertia of one blade will be

$I$ = 1/3 x 5500 x 44²

$I$ = 35.49 x 10⁵ kg.m²

Moment of inertia of 3 blades

$I$ = 3 x 35.49 x 10⁵ kg.m²

$I$ = 106.48 x 10⁵ kg.m²

b) Angular momentum 'L' is given by

L = $I$ x ω

where,

$I$ = moment of inertia of turbine i.e 106.48 x 10⁵ kg.m²

ω=angular velocity =2π f

f is frequency of rotation of blade i.e 13 rpm

f = 13 rpm=>= 13 / 60 revolution per second

ω = 2π f => 2π x 13 / 60 rad / s

L= $I$ x ω =>106.48 x 10⁵ x 2π x 13 / 60

= 144.97 x 10⁵ kgm² s⁻¹

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In a ceiling fan, electrical energy, N, is transferred to another form, M. Energy transfers are never 100% efficient. Some of th

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In a ceiling fan, electrical energy, N, is transferred to another form, M. Energy transfers are never 100% efficient. Some of the energy is "wasted" as heat. To what form is the electrical energy (N) transferred (M) to allow the ceiling fan to function? The answer B. Kinetic Energy

Explanation:Electrical energy (N) is transferred to: kinetic energy (M)

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Explanation:

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And, when an electron cloud contains a negatively charged ion then it is able to participate in a chemical reaction as it needs to gain stability.

Therefore, we can conclude that the nucleus contains positively charged particles called protons and neutral particles called neutrons, which are bound together by the strong nuclear force. The electron cloud contains negatively charged particles, which participate in chemical reactions.

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A 0.111 kg hockey puck moving at 55 m/s is caught by a 80. kg goalie at rest. with what speed does the goalie slide on the frict

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Answer:

0.076 m/s

Explanation:

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m v = (m + M) V

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