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2 years ago

What is the speed of a wave with a frequency of 100 hz and a wave length of .5 m?

Physics

2 answers:

____ [38]2 years ago

7 0

Answer:

Explanation:

There are 2 ways to help with this. Explain the details, which are fairly simple in this topic, or give the formula. My hope is that an explanation will last longer than memorizing the formula. I give you both.

If a wave has frequency, f, of 3 Hz, its period, T, is

. The wavelength,

, is 5 meters. That means that in the time of one period, the wave travels 5 m.

In general,

distance

time

In applying this general definition of speed

↑

to a wave, we have

speed of the wave

wavelength

period

Note: we generally use v for speed of a wave. Using the variable names, then that last formula is written

Since

, we can also say that

⋅

So, using that last formula

⋅

Note: the unit Hz is equivalent to what it was called 100 years ago,

cycles

second

(

also cps

)

. Cycles is not a true unit, so the Hz contributed only the "per second" to the result

ElenaW [278]2 years ago

4 0

Answer: the speed is =30ms^-1 The speed of a wave is given by "speed" (ms^-1)= "frequency(Hz)" xx "wavelength (m)" The frequency is f=100Hz The wavelength is lambda=0.3m The speed is v=lambdaf=0.3*100=30ms^-1

Explanation:

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3 years ago

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Free falling objects accelerate at 9.8 m/s because the force of

Gala2k [10]

The answer is
B. Gravity

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3 years ago

What is one of the earliest ways that ancient peoples produced light?

VARVARA [1.3K]

Answer:

Candles

Explanation:

The answer is the first option or "candles." In ancient times the people would lit candles and place them in difference places in their homes, temples, etc... to produce light. It's not option B because light emitting diodes are used to light up toys and such which weren't invented in ancient times. It's not option C because fluorescent bulbs are long light bulbs used to light up huge spaces without as many light bulbs which were again not invented at the time, and it's also not option D because incandescent bulbs are you usual light bulbs which weren't invented at the time.

Hope this helps.

4 0

3 years ago

A boat takes off from the dock at 2.5m/a and speeds up at 4.2m/s/s for 6.0 s. How far has the boat traveled? Round answer to nea

natima [27]

Answer:

91 m

Explanation:

v₀ = 2.5 m/s

a = 4.2 m/s²

t = 6.0 s

Find: Δx

Δx = v₀ t + ½ at²

Δx = (2.5 m/s) (6.0 s) + ½ (4.2 m/s²) (6.0 s)²

Δx = 90.6 m

Rounded to the nearest whole number, the distance traveled is 91 m.

6 0

3 years ago

A battery is connected to the two ends of a conducting rod and the current through it is measured.a) Another rod, made of the sa

IceJOKER [234]

Answer:

a) - the resistance is proportional to the length of the metal

- a thicker rod, since resistance decreases with increasing area

b) The current is proportional to the area so this is the factor that is influenced by the electric field

Explanation:

a) When the rod is connected to the rod an electrical circuit described by the expression is formed

V = I R

I = V / R

The resistance of the rod is

R = ρ L / A

Where ρ is the resistivity of metal, L Longitud and A cross section.

If a higher current is measured when the other rod is connected, it implies that the resistance has decreased. To have a decrease in resistance you have two possibilities

- use a shorter rod, since the resistance is proportional to the length of the metal

- Use a thicker rod, since resistance decreases with increasing area, remember that the area of a circle is

A = π R²

Therefore, small increases in the diameter of the rod could give great changes in resistance.

b) The current is defined with the charge that crosses a surface per unit of time, when the electric field increases the electrons feel a greater force, therefore the current increases.

The charge number on a wire is

Q = q n $v_{d}$ Δt A

So up to date is

I = q n When the rod is connected to the rod an electrical circuit described by the expression is formed

V = I R

I = V / R

The resistance of the rod is

R = rho L / A

Where rho is the resistivity of metal, L e; Long and A cross section.

If a higher current is measured when the other rod is connected, it implies that the resistance has decreased. To have a decrease in resistance you have two possibilities

.- use a shorter rod, since the resistance is proportional to the length of the metal

. - Use a thicker rod, since resistance decreases with increasing area, remember that the area of a circle is

A = pi R2

Therefore, small increases in the diameter of the rod could give great changes in resistance.

.b) The current is defined with the charge that crosses a surface per unit of time, when the electric field increases the electrons feel a greater force, therefore the current increases.

The load number on a wire is

Q = q n $v_{d}$ Dt A

So current is

I = q n v_{d} A

The drag speed (v_{d}) is constant in the materials, it depends on the purity and imperfections, so a change in the length does not significantly change the current.

The current is proportional to the area so this is the factor that is influenced by the electric field

The drag speed (vd) is constant in the materials, it depends on the purity and imperfections, so a change in the length does not significantly change the current.

The current is proportional to the area so this is the factor that is influenced by the electric field

8 0

3 years ago