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marishachu [46]

3 years ago

12

Sunlight is composed of wavelengths of light that make up part of the electromagnetic spectrum. Towson University Exam Question.

The frequency of a wave is directly proportional to the speed at which the wave is traveling. Do NOT Copy! Calculate the frequency (in Hz) of light at the following wavelength:

1 answer:

Helen [10]3 years ago

4 0

Answer:

$f= 5.11 * 10^{10}Hz$

Explanation:

Given

$\lambda = 0.587cm$

<em>See comment for complete question</em>

Required

Calculate the frequency

Frequency is calculated using:

$f = \frac{c}{\lambda}$

Where

$c \to$ speed of light

$c =299792458 ms^{-1}$

$\lambda = 0.587cm$

Convert wave length to meters

$\lambda = 0.587 * 0.01m$

$\lambda = 0.00587m$

So, we have:

$f = \frac{c}{\lambda}$

$f=\frac{299792458 ms^{-1}}{0.00587m}$

$f=\frac{299792458}{0.00587}Hz$

$f= 5.11 * 10^{10}Hz$

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Who reported four “element” classifications, but included some substances that were combinations of elements rather than true el

notsponge [240]

Antoine-Laurent Lavoisier was the first person to report the four element classification system but also ended up including some compounds rather than elements.

7 0

3 years ago

Light bulb 1 operates with a filament temperature of 3000 K, whereas light bulb 2 has a filament temperature of 2000 K. Both fil

MatroZZZ [7]

Answer:

A₁/A₂ = 0.44

Explanation:

The emissive power of the bulb is given by the formula:

P = σεAT⁴

where,

P = Emissive Power

σ = Stefan-Boltzman constant

ε = Emissivity

A = Surface Area

T = Absolute Temperature of Surface

<u>FOR BULB 1:</u>

Since, emissivity and emissive power are constant.

Therefore,

P = σεA₁T₁⁴ ----------- equation 1

where,

A₁ = Surface Area of Bulb 1

T₁ = Temperature of Bulb 1 = 3000 k

<u>FOR BULB 2:</u>

Since, emissivity and emissive power are constant.

Therefore,

P = σεA₂T₂⁴ ----------- equation 2

where,

A₂ = Surface Area of Bulb 2

T₂ = Temperature of Bulb 1 = 2000 k

Dividing equation 1 by equation 2, we get:

P/P = σεA₁T₁⁴/σεA₂T₂⁴

1 = A₁(3000)²/A₂(2000)²

A₁/A₂ = (2000)²/(3000)²

<u>A₁/A₂ = 0.44</u>

6 0

3 years ago

Two circular coils are concentric and lie in the same plane. The inner coil contains 170 turns of wire, has a radius of 0.012 m,

GREYUIT [131]

Answer:

The current of the outer coil is $I_o = 3.99 \ A$

Explanation:

From the question we are told that

The number of turns of the inner coil is $N_i = 170 \ turn$

The radius of the inner coil is $R_i = 0.012 \ m$

The current of the inner coil is $I_i = 6.2 \ A$

The number of turns of the outer coil is $N_o = 220 \ turns$

The radius of the outer coil is $R_o = 0.02 0 \ m$

Generally the net magnetic field is mathematically represented as

$B = \frac{N \ mu I }{ 2 * R }$

Now from told that the net magnetic field is common

So

$\frac{N_i \mu I_i} {2 * R _i} = \frac{N_o \mu I_o} {2 * R _o}$

Here $\mu$ is the permeability of free space

making $I_o$ the subject

$I_o = \frac{ N_i I_i *2 * R _o}{N_o *2 * R _i}$

substituting values

$I_o = \frac{ 170 *6.2 *2 * 0.020}{220 *2 * 0.012}$

$I_o = 3.99 \ A$

5 0

4 years ago

A 2300 kg truck has put its front bumper against the rear bumper of a 2400 kg SUV to give it a push. With the engine at full pow

IrinaK [193]

Answer:

a) $a_{max} = 3.8\,\frac{m}{s^{2}}$ , b) $F = 9260\,N$

Explanation:

a) The maximum possible acceleration that the truck can give to the SUV is:

$a_{max} = \frac{18,000\,N}{2,400\,kg+2300\,kg}$

$a_{max} = 3.8\,\frac{m}{s^{2}}$

b) The equation of equilibrium for the truck is:

$18,000\,N - F = (2,300\,kg)\cdot (3.8\,\frac{m}{s^{2}})$

The force of the SUV's bumper on the truck's bumper is:

$F = 9260\,N$

3 0

3 years ago

Read 2 more answers

A series LR circuit consists of a 2.0-H inductor with negligible internal resistance, a 100-ohm resistor, an open switch, and a

VMariaS [17]

Answer:

The maximum power delivered by the power supply is 0.81 W.

Explanation:

Given that,

Inductance L= 2.0 H

Resistance R = 100 ohm

Voltage = 9.0 V

We need to calculate the power

Using formula of power

$P = \dfrac{V^2}{R}$

Where, P = power

V = voltage

R = resistance

Put the value into the formula

$P = \dfrac{(9.0)^2}{100}$

$P =0.81\ W$

Hence, The maximum power delivered by the power supply is 0.81 W.

7 0

4 years ago