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Kamila [148]
4 years ago
7

A radio station has a frequency of 101.9 mega hertz. What is the wavelength in meters of the waves the ones from its radio tower

.
Physics
1 answer:
bekas [8.4K]4 years ago
6 0

Answer:

2.944 m

Explanation:

Frequency of radio waves, f = 101.9 mega Hertz

Convert the mega Hertz into Hertz

As we know that 1 mega Hertz = 10^6 Hz

f = 101.9 x 10^6 Hz

As the radio waves are electromagnetic waves, so the speed of radio waves is equal to the speed of light in vacuum.

v = c = 3 x 10^8 m/s

The relation between the frequency and wavelength is given by

v = f x λ

where, λ be the wavelength

\lambda =\frac{v}{f}=\frac{3\times10^{8}}{101.9\times10^6}

λ = 2.944 m

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The diagram below shows the path of a planet around a star.
Anit [1.1K]

Answer:

Point C

Explanation:

Centripetal acceleration ac is inversely proportional to radius of orbit so it is greatest at point C.

7 0
3 years ago
Sunlight is made up of EM waves. True or False
GrogVix [38]

Answer:

true

Explanation:

7 0
3 years ago
what is the energy required to melt down a 12,400g Gold bar assuming its temperature goes from 23c to 1,064c
sergejj [24]

1665183.6J

Explanation:

Given parameters:

Mass of Gold = 12400g

Initial temperature = 23°C

Final temperature = 1064°C

Unknown:

Energy required to melt = ?

Solution:

The amount of heat required to cause this temperature change to heat the gold bar is given as;

   H    =   m  c Ф

 m is the mass of gold bar

  c is the specific heat capacity of gold

  Ф is the heat change

 Specific heat capacity of gold = 0.129J/g°C

  H = m c (Ф₂ - Ф₁)

 H = 12400 x 0.129 x (1064 - 23) = 1665183.6J

learn more:

Specific heat capacity brainly.com/question/7210400

#learnwithBrainly

5 0
3 years ago
An inclined plane has a velocity ratio of 2 and efficiency of 95%. it is used to raise a load of 400newtons. determine mechanica
Travka [436]

Answer:

1.9

Explanation:

Efficiency=mechanical advantage/velocity ratio×100

95=M.A/2×100

95=50M.A

M.A=95/50=1.9

4 0
2 years ago
Scientists are working on a new technique to kill cancer cells by zapping them with ultrahigh-energy (in the range of 1012 W) pu
Tcecarenko [31]

1. 7.95\cdot 10^6 J

The total energy given to the cells during one pulse is given by:

E=Pt

where

P is the average power of the pulse

t is the duration of the pulse

In this problem,

P=1.59\cdot 10^{12}W

t=5.0 ns = 5.0\cdot 10^{-9} s

Substituting,

E=(1.59\cdot 10^{12}W)(5.0 \cdot 10^{-6}s)=7.95\cdot 10^6 J

2. 1.26\cdot 10^{21}W/m^2

The energy found at point (1) is the energy delivered to 100 cells. The radius of each cell is

r=\frac{4.0\mu m}{2}=2.0 \mu m = 2.0\cdot 10^{-6}m

So the area of each cell is

A=\pi r^2 = \pi (2.0 \cdot 10^{-6}m)^2=1.26\cdot 10^{-11} m^2

The energy is spread over 100 cells, so the total area of the cells is

A=100 (1.26\cdot 10^{-11} m^2)=1.26\cdot 10^{-9} m^2

And so the intensity delivered is

I=\frac{P}{A}=\frac{1.59\cdot 10^{12}W}{1.26\cdot 10^{-9} m^2}=1.26\cdot 10^{21}W/m^2

3. 9.74\cdot 10^{11} V/m

The average intensity of an electromagnetic wave is related to the maximum value of the electric field by

I=\frac{1}{2}c\epsilon_0 E^2

where

c is the speed of light

\epsilon_0 is the vacuum permittivity

E is the amplitude of the electric field

Solving the formula for E, we find:

E=\sqrt{\frac{2I}{c\epsilon_0}}=\sqrt{\frac{2(1.26\cdot 10^{21} W/m^2)}{(3\cdot 10^8 m/s)(8.85\cdot 10^{-12}F/m)}}=9.74\cdot 10^{11} V/m

4. 3247 T

The magnetic field amplitude is related to the electric field amplitude by

E=cB

where

E is the electric field amplitude

c is the speed of light

B is the magnetic field

Solving the equation for B and substituting the value of E that we found at point 3, we find

B=\frac{E}{c}=\frac{9.74\cdot 10^{11} V/m}{3\cdot 10^8 m/s}=3247 T

3 0
3 years ago
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