Pls help All objects above _____ emit radiation. 0°C 0°F 0 K 100 K

Physics

2 answers:

aivan3 [116]3 years ago

8 0

<span>All objects above 0(zero)K emit radiation.</span>

sveta [45]3 years ago

6 0

All objects above absolute 0 (0 k) emit radiation.

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What kind of wave (transverse of longitudinal) is each of the following and why?

Elina [12.6K]

Answer:

1.) Longitudinal waves

2.) Transverse waves

3.) Longitudinal waves

Explanation:

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A pulse sent down a stretched rope by snapping one end of it. ( transverse wave) because its oscillations are perpendicular to the direction of the wave or path of propagation

The vibrations in a guitar string

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A foot player runs 1.6m/s and has a KE of 790 J. What is his mass?

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The equation for kinetic energy is,

Ke = (1/2)mv^2.

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790 = (1/2)(1.6)^2(m).

Solving for m, we get,

m = (790)/(0.5(1.6)^2).

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3 years ago

The diagram shows waves of sound travelling through the air. By which factor is the sound intensity decreased at 3 meters?

SIZIF [17.4K]

The diagram is missing; however, we know that the intensity of a sound wave is inversely proportional to the square of the distance from the source:
$I(r)= \frac{1}{r^2}$
where I is the intensity and r is the distance from the source.

We can assume for instance that the initial distance from the source is r=1 m, so that we put
$I= \frac{1}{r^2}= \frac{1}{(1)^2}=1$
The intensity at r=3 m will be
$I= \frac{1}{r^2}= \frac{1}{(3)^2}= \frac{1}{9}$
Therefore, the sound intensity has decreased by a factor $1/9$ .