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laiz [17]
3 years ago
8

What is a string theory ?

Physics
2 answers:
Serggg [28]3 years ago
8 0
It is a unified theory than can describe whole world.
Dovator [93]3 years ago
7 0

Answer:

String theory is a set of attempts to model the four known fundamental interactions—gravitation, electromagnetism, strong nuclear force, weak nuclear force—together in one theory. ... Einstein had sought a unified field theory, a single model to explain the fundamental interactions or mechanics of the universe

Explanation:

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Is there a definite end to our atmosphere?
Irina18 [472]
There is no definite end to earths atmosphere, but technically the border between the outer space and earth gets thinner as you move up from the earths surface. The Karman line is the closest definition there is which describes the end of the earth's atmosphere, it is 100 km above earth's sea level at approximately 1.56 % of total earth's radius. This describes the boundary between the outer space and the atmosphere.
7 0
3 years ago
Parallel light rays are refracted _______and_____ to a point called as focal point after passing through convex lens.
tatuchka [14]
Left and right to a point called ad focal point after passing through convex lens
4 0
1 year ago
A brass rod with a mass of 0.300 kg slides on parallel horizontal iron rails, 0.440 m apart, and carries a current of 15.0 A. Th
Digiron [165]

Answer:

The magnitude of the magnetic field is  B  =  0.0890 \ T

Explanation:

From the question we are told that

   The mass of the rod is  m =0.300 \ kg

    The distance of separation is  d = 0.440 \ m

     The current is  I  = 15.0 \ A

     The coefficient of friction is   \mu  =  0.300

     

Generally for the rod the rod to continue moving at a constant speed

   The frictional force must equal to the magnetic field force so

    F_m =  F_f

Where  F_m  =  B* I * d

and     F_f  =  \mu * m * g

   B*I *d =  \mu * m * g

=>    B  =  \frac{\mu * m * g }{I  * d }

substituting values

       B  =  \frac{0.2  * 0.300 * 9.8 }{ 15   * 0.440 }

       B  =  0.0890 \ T

8 0
3 years ago
A diode vacuum tube consists of a cathode and an anode spaced 5-mm apart. If 300 V are applied across the plates. What is the ve
Alex_Xolod [135]

Answer:

Velocity of the electron mid way = v = 6.47×10⁶ m/s  

Explanation:

Electric potential varies with distance as V(x) = C x^\frac{4}{3}

At a distance 5 mm , the constant C is evaluated.

C = V/x^\frac{4}{3}

    = 300/(0.005)^\frac{4}{3}

     = 3.50×10⁵  

Now at the mid point, x = 2.5 mm = 0.0025 m

Potential = V' = C x^\frac{4}{3}

                      = 3.50\times 10^5\times (0.0025)^\frac{4}{3}

                      = 119 V

Kinetic energy per unit charge is equal to the electric potential.

or 0.5 m v^2 = V' q

Here m is the mass of the electron and q is the charge of the electron.

m= 9.1×10⁻³¹ kg

q = 1.6×10⁻¹⁹ coulombs

⇒ v^2 = \frac{V q}{0.5 m}

⇒ v^2 = \frac{(119)(1.6\times 10⁻¹⁹)}{0.5 (9.1\times 10⁻³¹)}

⇒ v = 6.47×10⁶ m/s

⇒ Velocity of the electron mid way = v = 6.47×10⁶ m/s    

6 0
3 years ago
Light of wavelength 618.0 nm 618.0 nm is incident on a narrow slit. The diffraction pattern is viewed on a screen 84.5 cm 84.5 c
scZoUnD [109]

Answer:

83.55 μm

Explanation:

In a single slit experiment, the distance (on the screen), y, between the central maximum and the minimum of order, m, is given as:

y = \frac{md}{a} * λ

where λ = wavelength

a = width of slit

d = distance between slit and screen

To get the width of the slit, we make a the subject of formula:

a = (mλd)/y

a = \frac{2 * 618 * 10^{-9} * 84.5*10^{-2}}{1.25 * 10^{-2}}

(All units of length are in meters)

a = 8.355 * 10^{-5} m\\\\\\a = 83.55 * 10^{-6} m

a = 83.55 μm

8 0
3 years ago
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