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3 years ago

What type of electromagnetic waves do heat lamps give off?

Physics

2 answers:

Nitella [24]3 years ago

7 0

Microwaves c…………….nnsjksisisysgxgd

n200080 [17]3 years ago

6 0

C. Microwaves!!!!!!!!!!!!!

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A ruby laser delivers a 16.0-ns pulse of 4.20-MW average power. If the photons have a wavelength of 694.3 nm, how many are conta

stepan [7]

Answer:

The value is $n = 2.347 *10^{17} \ photons$

Explanation:

From the question we are told that

The amount of power delivered is $P = 4.20 \ M W = 4.20 *10^{6} \ W$

The time taken is $t = 16.0ns = 16.0 *10^{-9} \ s$

The wavelength is $\lambda = 694.3 \ nm = 694.3 *10^{-9} \ m$

Generally the energy delivered is mathematically represented as

$E = P * t = \frac{n * h * c }{\lambda }$

Where $h$ is the Planck's constant with value $h = 6.262 *10^{-34} \ J \cdot s$

c is the speed of light with value $c = 3.0*10^{8} \ m/s$

$4.20 *10^{6} * 16*10^{-9}= \frac{n * 6.626 *10^{-34} * 3.0*10^{8} }{694.3 *10^{-9}}$

=> $n = 2.347 *10^{17} \ photons$

4 0

3 years ago

The motor on a helicopter turns at an angular speed of 6.2 x 102 revolutions per minute. (a) Express this angular speed in radia

arsen [322]

Answer:

64.93 rad/s
38.956 km

Explanation:

(a)

$\dfrac{6.2\cdot 10^2\,\text{rev}}{60\,\text{s}}\times\dfrac{2\pi\,\text{rad}}{\text{rev}}=\dfrac{62\pi\,\text{rad}}{3\,\text{s}}\approx\boxed{64.93\,\text{rad/s}}$

(b)

$d=r\theta=(3.0\,\text{m})(2.0\cdot 10^2\,\text{s})\left(\dfrac{62\pi\,\text{rad}}{3\,\text{s}}\right)=124\pi\cdot 10^2\,\text{m}=\boxed{38\,956\,\text{m}}$

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3 years ago

How big is a wifi pulse signal coming from your router???

Brilliant_brown [7]

Answer:

About 15

Explanation:

7 0

3 years ago

Read 2 more answers

Mode of physical activity <br> A.frequency <br> B.intensity <br> C.time <br> D.type

Artyom0805 [142]

A.frequency

That's the answer

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3 years ago

Which happens to the magnetic field of a wire when you change the direction of the current in the wire? The magnetic field _____

zavuch27 [327]

The direction of the magnetic field around a wire depends on
the direction of the current flowing through the wire. When you
change the direction of the current in the wire, the direction of the
magnetic field around it also changes direction.

The current in every electric cord in your house changes its direction
120 times every second. So the magnetic field around every electric
cord in your house also changes its direction 120 times every second.

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3 years ago