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Mnenie [13.5K]
3 years ago
11

A system proposed by the U.S. Navy for underwater submarine communication, called ELF (for extremely low frequency), operates wi

th a frequency of 30Hz . What is the wavelength of this radiation in meters
Physics
2 answers:
kow [346]3 years ago
7 0

Answer

Wavelength= 30*20^8/30=10^7m

Explanation:

Velocity = frequency *wavelength

We're frequency=30HZ

Velocity of light= 3*10^8m/s

Wavelength= 30*20^8/30=10^7m

Explanation:

Nesterboy [21]3 years ago
5 0

Answer:

the wavelength of this radiation is 10 × 10⁶m = 10⁷m

Explanation:

Frequency, v = 30Hz = 30s⁻¹

wavelength of radiation = λ

Wavelength = speed of light / frequency

c = speed of light

c = 3 × 10⁸m/s

v = frequency

Wavelength =  3 × 10⁸ / 30

Wavelength = 10000000

Wavelength = 10 × 10⁶m

Wavelength = 10⁷m

Hence,  the wavelength of this radiation is 10 × 10⁶m = 10⁷m

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Two resistors A and B are arranged in series in one branch of a parallel arrangement. The other branch contains a single resisto
Ganezh [65]

Answer:

Explanation:

A and B are in series , Total resistance = Ra + Rb

This resistance is in parallel with single resistor C

Equivalent resistance Re = Rc x ( Ra + Rb ) / [Rc + ( Ra + Rb )]

Now this combination is in series in single resistance D .

Total resistance = Rd + Re

= Rd + { Rc x ( Ra + Rb ) / [Rc + ( Ra + Rb )] }

5 0
3 years ago
You jump off a truck and accelerate toward the surface of the Earth. Does the Earth accelerate toward you?
Triss [41]

When we jump from the truck and accelerate towards the earth surface, the earth also accelerates towards us but it's acceleration is very negligible.

To find the answer, we need to know about the acceleration of earth due to the gravitational attraction.

<h3>What's the gravitational force between the earth and a person?</h3>
  • Gravitational attraction force is GMm/r² between the earth and a person.
  • M= mass of the earth

m= mass of the person

r= separation between them.

<h3>What's the acceleration of the earth towards the person when he jumps from a truck?</h3>
  • According to Newton's second law, Force = M×acceleration
  • Acceleration= Force / M
  • Here, Force = GMm/r²,

so acceleration of earth= Gm/r²

  • As this acceleration is very small, so we can't notice it.

Thus, we can conclude that the earth also accelerates towards us.

Learn more about the gravitational force here:

brainly.com/question/72250

#SPJ4

7 0
2 years ago
2) How much work is required to pull a sled 15<br> meters if you use 30N of force?
geniusboy [140]

2 people

Explanation:

7 0
3 years ago
How many centimeters are in 3.50 feet?
Kazeer [188]
106.68 centimetres are in 3.50 feet
4 0
3 years ago
There are 3.3V passing through an orange power supply cable, and there are 0.025 ohms of resistance in the orange wire. How much
PIT_PIT [208]
P = V^2 / R.

So, 3.3^2 / 0.025 = 435.6W.

Note, you can get the power equation from:
P = V*I. Also, I = V/R.
Substituting V/R in for I in the 1st equation, you get P = V^2 / R.
5 0
3 years ago
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