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Ratling [72]
3 years ago
9

Which of the following is a characteristic of electromagnetic waves?

Physics
2 answers:
netineya [11]3 years ago
8 0

Answer:

they are eletric and magnetic

Explanation:

Andru [333]3 years ago
6 0

they can travel with or without a medium

hope this helps :))

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Use the exact values you enter to make later calculations. Jack and Jill are on two different floors of their high rise office b
erastovalidia [21]

The part B of the question is missing and it is;

b) What is the height between the two window ledges?

Answer:

A) 20.76 m/s

B) 161.52 m

Explanation:

A) To calculate the initial speed we use the formula from Newton's first law of motion:

v = u + at

Making u the subject gives;

u = v - at

Where;

v is the final velocity which is the speed when Jill sees the pot = 60 m/s

u is the initial velocity which is the speed when Jack sees the pot go by

t is the time between the two observed events = 4 s

a in this question is acceleration due to gravity = 9.81 m/s².

Plugging in the relevant values into the initial velocity equation gives;

u = 60 - (9.81 × 4)

u = 20.76 m/s

B) To get the height difference, we will use the formula;

(y1 - y0) = ut + ½at²

Thus, plugging in the relevant values, we have;

y1 - y0 = (20.76 × 4) + (½ × 9.81 × 4²)

(y1 - y0) = 161.52 m

3 0
4 years ago
If a wave vibrates back and forth 12 times each second, what is period of the wave?
Dmitrij [34]

Answer:

I think it might be 9 hz but not 100% shore though

Explanation:

7 0
3 years ago
Is there a difference between potential difference, voltage and EMF?
Andreas93 [3]
There may be an esoteric technical shade or nuance of difference.  But I've been an electrical engineer for 40 years now, and have always used them interchangeably.

(I would have answered your question by saying "No.", but this website won't accept an answer that's less than 200 characters long.)
8 0
4 years ago
a golfer hits a golf ball giving it an initial velocity 30m/s at an angle 45° from the horizontal. ignoring air resistance on a
Lynna [10]

Answer:

90 meters.

Explanation:

The correct answer is: B.) 90 m

4 0
3 years ago
For atomic hydrogen, the Paschen series of lines occurs when nf = 3, whereas the Brackett series occurs when nf = 4 in the equat
zvonat [6]

Answer:

(\lambda_{max} )_{brackett} < (\lambda_{min} )_{paschen}

So the two wavelength range will over lap

Explanation:

The Rydberg equation is given by

\frac{1}{\lambda} =\frac{2\pi mk^2e^4}{h^3c} t (\frac{1}{n^2_f}-\frac{1}{n^2_i}  )

m is the mass of electron

k = 1/4π∈₀

∈₀ = is the permitivity of free space

e is the charge of electron

h is the plank constant

c is the speed of light in vaccum

z is the atomic number = 1

\frac{1}{\lambda} =R (\frac{1}{n^2_f}-\frac{1}{n^2_i}  )

where R is the  Rydberg constant = 1.097373 × 10⁷m⁻¹

For  Paschen series of H spectrum

n_f = 3

n_i = 5,6,7 ...

in Paschen series of H spectrum

The maximum wavelength occur for n_i = 4

\frac{1}{\lambda_m_a_x } =(1.097373 \times 10^7)(\frac{1}{9} - \frac{1}{16} )\\\\\lambda_m_a_x=1874.6nm

The minimum wavelength occur for n_i = ∞

\frac{1}{\lambda_m_i_n } =(1.097373 \times 10^7)(\frac{1}{9} - \frac{1}{_o_o} )\\\\\lambda_m_a_x=820.14nm

The brackett series of H spectrum

The maximum wavelength occur for n_i = 4

\frac{1}{\lambda_m_a_x } =(1.097373 \times 10^7)(\frac{1}{16} - \frac{1}{25} )\\\\\lambda_m_a_x=4050.05nm

The minimum wavelength occur for n_i = ∞

\frac{1}{\lambda_m_i_n } =(1.097373 \times 10^7)(\frac{1}{16} - \frac{1}{_o_o} )\\\\\lambda_m_a_x=1458.03nm

(\lambda_{max} )_{brackett} < (\lambda_{min} )_{paschen}

So the two wavelength range will over lap

8 0
3 years ago
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