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stich3 [128]
3 years ago
13

Bohr found experimental evidence for his atomic model by studying

Physics
2 answers:
Alona [7]3 years ago
7 0

Answer:

Bohr found experimental evidence for his atomic model by studying <em><u>line spectra</u></em>.

Elden [556K]3 years ago
5 0

Answer:

Bohr found experimental evidence for his atomic model by studying line spectra.

Line Spectra is plural of a line spectrum and a line spectrum is an emission of light, sound, or other radiation, composed of a number of discrete frequencies or energies (a spectrum).

  • (\) QueTooOfficial (/)
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An evacuated tube uses an accelerating voltage of 40 kV to accelerate electrons to hit a copper plate and produce x rays. Nonrel
lozanna [386]

Answer:

<em>1.187 x 10^8 m/s</em>

<em></em>

Explanation:

the potential of the electric field V = 40 kV = 40000 V

the charge on an electron e = 1.6 x 10^-19 C

The energy of an accelerated electron in an electric field is given as

E = eV

E = 1.6 x 10^-19 x 40000 = 6.4 x 10^-15 J

This energy is equal to the kinetic energy with which the electron moves,  according to the conservation of energy.

The kinetic energy = \frac{1}{2}mv^{2}

where

m is the mass of the electron = 9.109 x 10^-31

v is the speed of the electron.

Equating the energy, we have

6.4 x 10^-15 = \frac{1}{2}*9.109*10^-31*v^{2}

6.4 x 10^-15 = 4.55 x 10^-31 v^{2}

v^{2} = 1.41 x 10^16

x^{2} v = \sqrt{1.41*10^{16}} = <em>1.187 x 10^8 m/s</em>

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3 years ago
Which statement best describe genetic marital
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Answer:

B.)  Genes are segments of DNA, which is packaged in chromosomes.

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Optical tweezers use light from a laser to move single atoms and molecules around. Suppose the intensity of light from the tweez
Zanzabum

(a)  3.3\cdot 10^{-6} Pa

The radiation pressure exerted by an electromagnetic wave on a surface that totally absorbs the radiation is given by

p=\frac{I}{c}

where

I is the intensity of the wave

c is the speed of light

In this problem,

I=1000 W/m^2

and substituting c=3\cdot 10^8 m/s, we find the radiation pressure

p=\frac{1000 W/m^2}{3\cdot 10^8 m/s}=3.3\cdot 10^{-6}Pa

(b) 4.4\cdot 10^{-8} m/s^2

Since we know the cross-sectional area of the laser beam:

A=6.65\cdot 10^{-29}m^2

starting from the radiation pressure found at point (a), we can calculate the force exerted on a tritium atom:

F=pa=(3.3\cdot 10^{-6}Pa)(6.65\cdot 10^{-29} m^2)=2.2\cdot 10^{-34}N

And then, since we know the mass of the atom

m=5.01\cdot 10^{-27}kg

we can find the acceleration, by using Newton's second law:

a=\frac{F}{m}=\frac{2.2\cdot 10^{-34} N}{5.01\cdot 10^{-27} kg}=4.4\cdot 10^{-8} m/s^2

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3 years ago
Which has more kinetic energy, a basketball rolling at a walking pace or a baseball rolling at the pace of someone running? How
icang [17]

Answer:

answer 2 because the baseball has less mass then the 1st one

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