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3 years ago

Which of the following is not a source of light? * a) sun b) star c) mirror d)cfl

Physics

1 answer:

Vladimir [108]3 years ago

5 0

I think that would be c) mirror because mirrors reflects light and can't create it.

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A non-reflective coating that has a thickness of 198 nm (n = 1.45) is deposited on top of a substrate of glass (n = 1.50). What

spin [16.1K]

Answer:

The wavelength is $\lambda_ 1 = 574.2 nm$

Explanation:

From the question we are told that

The thickness is $t = 198 nm = 198 *10^{-9 }\ m$

The refractive index of the non-reflective coating is $n_m = 1.45$

The refractive index of glass is $n_g = 1.50$

Generally the condition for destructive interference is mathematically represented as

$2 * n_m * t * cos (\theta) = n * \lambda$

Where $\thata$ $\theta$ is the angle of refraction which is 0° when the light is strongly transmitted

and n is the order maximum interference

$\lambda = \frac{2 * n * t * cos (\theta )}{n}$

at the point n = 1

$\lambda _1 = \frac{2 * 1.45 * 198*10^{-9} * cos (0 )}{1}$

$\lambda_1 = 574.2 *10^{-9}$

$\lambda_1 = 574.2 nm$

at n =2

$\lambda _2 = \frac{\lambda _1 }{2}$

$\lambda _2 = \frac{574.2*10^{-9} }{2}$

$\lambda _2 = 2.87 1 *10^{-9} \ m$

$\lambda _2 = 287. 1 nm$

Now we know that the wavelength range of visible light is between

$390 \ nm \to 700 \ nm$

So the wavelength of visible light that is been transmitted is

$\lambda_ 1 = 574.2 nm$

6 0

4 years ago

The vine has a fixed end, so Tarzan's path is circular. So the vine must not only support Tarzan's weight (or some component of

Minchanka [31]

Answer: hello your question lacks some data attached below is the missing data

answer : T - mg = ma $_{c}$

Explanation:

Given that the vine has a fixed end and Tarzan's path is circular

At Tarzans lowest point the point can be expressed as shown below.

It can be expressed as : T - mg = ma $_{c}$

8 0

3 years ago

How much power is used by car when it applies 40,000 J of work over a 5.6 second interval

Tcecarenko [31]

Answer:

7142.86W

Explanation:

Given parameters:

Work done by brake = 40000J

Time taken = 5.6s

Unknown:

Power used by car = ?

Solution:

Power can be defined as the rate at which work is done. It is mathematically expressed as;

Power = $\frac{work done }{time taken}$

Now input the variables;

Power = $\frac{40000}{5.6}$ = 7142.86W

8 0

3 years ago

A seismic wave is energy released as the result of rock movement along a fault.<br> T/F

Vladimir [108]

Answer:

TRUE

Explanation:

7 0

3 years ago

How far does a car travel as it accelerates from rest to 24 m/s in 6 seconds?

____ [38]

Answer:

$\boxed{\sf Distance \ travelled = 72 \ m}$

Given:

Initial velocity (u) = 0 m/s (Starts from rest)

Final velocity (v) = 24 m/s

Time taken (t) = 6 seconds

To Find:

Distance travelled by car (s)

Explanation:

From equation of motion of object moving with uniform acceleration in straight line we have:

$\boxed{ \bold{s = (\frac{v + u}{2} )t}}$

By substituting value of v, u & t in the equation we get:

$\sf \implies s = ( \frac{24 + 0}{2} ) \times 6 \\ \\ \sf \implies s = \frac{24}{2} \times 6 \\ \\ \sf \implies s = 12 \times 6 \\ \\ \sf \implies s = 72 \: m$

$\therefore$

Distance travelled by car (s) = 72 m

7 0

4 years ago