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3 years ago

What is the highest frequency wave? The lowest frequency wave?

Physics

2 answers:

Readme [11.4K]3 years ago

6 0

Answer:

Gamma rays have the highest energies, the shortest wavelengths, and the highest frequencies. Radio waves, on the other hand, have the lowest energies, longest wavelengths, and lowest frequencies of any type of EM radiation.

Explanation:

Hope this helps:)

Vinil7 [7]3 years ago

3 0

Answer:

1. gamma rays 2. Radio waves

Explanation:

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A car speeds over a hill past point A, as shown in the figure. What is the maximum speed the car can have at point A such that i

Lubov Fominskaja [6]

Answer:

11.8 m/s

Explanation:

At the top of the hill, there are two forces on the car: weight force pulling down (towards the center of the circle), and normal force pushing up (away from the center of the circle).

Sum of forces in the centripetal direction:

∑F = ma

mg − N = m v²/r

At the maximum speed, the normal force is 0.

mg = m v²/r

g = v²/r

v = √(gr)

v = √(9.8 m/s² × 14.2 m)

v = 11.8 m/s

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3 years ago

77. The first law of motion applies to

Mama L [17]

In the first law, an object will not change its motion unless a force acts on it. So I think the answer is A. Only objects that are moving.

8 0

3 years ago

Shrinking Loop. A circular loop of flexible iron wire has an initial circumference of 167 cm , but its circumference is decreasi

PSYCHO15rus [73]

Answer:

a) fem = - 0.0103 V, b) the applied field is in a vertical upward direction, the induced current is clockwise.

Explanation:

a) For this exercise we use Faraday's law

fem = $- \frac{d \phi}{dty}$

the magnetic flux is

Ф = B. A = B A cos θ

The bold letters indicate vectors, in this case the direction of the magnetic field and the normal to the circumference is parallel therefore the angle is zero and the cos 0 = 1

fem = - B dA / dt

the area of a circle is

A = π r²

et's perform the derivative

dA / dt =π 2r $\frac{dr}{dt}$

we substitute

fem = - B 2π r $\frac{dr}{dt}$

the circumference of a circle is

L = 2π r

we substitute

fem = - B L ( L )

fem =

Let's find the circumference for the 9 s, let's use a direct rule of proportions

If the circumference changes 13cm at t = 1. how much does it change at t=9s

ΔL = 13cm (9s / 1s) = 117cm

the circumference that is

L = Lo - ΔL

L = 167 - 117

L = 50 cm

let's reduce all magnitudes to the SI system

L = 0.50 m

= 0.130 m / s

calculate us

fem = - 1.00 0.50 0.130

fem = - 0.0103 V

b) the electromotive force induced in the opposite direction to the change of the radius and is decreasing with time, the current follows the direction of the decreased voltage therefore the current is induced in the opposite direction to the change of the magnetic flux.

If the applied field is in a vertical upward direction, the induced current is clockwise.

3 0

3 years ago

A beam of light passes from air into a cube of zirconium if the angle of incidence is 40”what is the angle of refraction ?

Colt1911 [192]

Answer:

50 degrees

Explanation:

Usually in physics in solving such questions refractive index of air is taken as 1.00 (n=1.00) by assuming that air is a vacuum. Hence, the light ray passes from water to air at an angle of incident of 40 degrees, it means that it has angle of 50 degrees to the normal line.

5 0

4 years ago

X- rays with a wavelgnth of 0.0700 nm diffract from a crystal. Two adjacne angels of x-ray diffraciton are 45.6 and 21.0 degrees

zhenek [66]

Answer:

0.15 nm

Explanation:

d = Distance between the atomic planes

m = Order

$\theta_{m}$ = First angle = $45.6^{\circ}$

$\theta_{m+1}$ = Adjacent angle = $21^{\circ}$

$\lambda$ = Wavelength = 0.07 nm

From Bragg's relation we know

$2d\cos\theta_{m}=m\lambda$

$2d\cos45.6^{\circ}=m0.07$

$2d\cos\theta_{m+1}=(m+1)\lambda$

$2d\cos21^{\circ}=(m+1)0.07\\\Rightarrow 2d\cos21^{\circ}=m(0.07)+0.07$

$2d\cos21^{\circ}=2d\cos45.6^{\circ}+0.07\\\Rightarrow 2d(\cos21^{\circ}-\cos45.6^{\circ})=0.07\\\Rightarrow d=\dfrac{0.07}{2(\cos21^{\circ}-\cos45.6^{\circ})}\\\Rightarrow d=0.14962\ \text{nm}$

The distance between the atomic planes is 0.15 nm.

4 0

3 years ago