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Feliz [49]
3 years ago
15

How are electromagnetic waves used in the military?

Physics
1 answer:
sweet [91]3 years ago
7 0
It uses electromagnetic radiation waves to enable military communications, navigation, radar, nonintrusive inspection of aircraft, and other equipment. Hope this helps.
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The percentage of incident light radiation reflected back to space is termed albedo. True or false?
liubo4ka [24]

Answer:True

Explanation:

Albedo is a unit-less, non-dimensional quantity that shows how well a surface reflects solar energy. The value of albedo can vary from 0 to 1, 0 being the black and 1 refers to a white surface. Zero means Surface is a perfect absorber i.e. it absorbs all the incoming rays incidents on it. Albedo 1 means the surface is a perfect reflector.

Albedo usually applies for visible light, even though it may involve some of the infrared regions of the electromagnetic spectrum. The average albedo associated with earth surface is 30%

8 0
3 years ago
What are the general characteristics of a solid?
Arisa [49]
Fixed volume and shape
-Particles are locked into place
Not easily compressible
-Little free space between particles
Does not flow easy
-Particles cannot move past each other


4 0
3 years ago
A switch and a fuse should be connected with a live wire in an electric circuit​
kykrilka [37]

Answer is A switch or a fuse in an electrical circuit is always connected to the live wire so that the socket or appliance is not live when switched off.

i hope it is helpful

6 0
3 years ago
Two stars, both of which behave like ideal blackbodies, radiate the same total energy per second. The cooler one has a surface t
Blizzard [7]

Answer:

Explanation:

Let hotter star has surface area of A . The cooler star would have surface area 9 times that of hotter star ie 9A , because its radius is 3 times hot star. Let temperature of hot star be T ₁.

Total radiant energy is same for both the star

Using Stefan's formula of black body radiation,

For cold star E = 9A x σ T⁴

For hot star E = A x σ T₁⁴

A x σ T₁⁴ = 9A x σ T⁴

T₁⁴ = (√3)⁴T⁴

T₁ = √3T .

b )

Let the peak intensity wavelength be λ₁ and λ₂ for cold and hot star .

As per wein's law

for cold star , λ₁ T = b ( constant )

for hot star  λ₂ √3T = b

dividing

λ₁ T / λ₂ √3T = 1

λ₂  / λ₁ =  1 / √3

7 0
3 years ago
A sound wave can be considered as a displacement wave or a pressure wave? What phase difference exists between the displacement
netineya [11]
Where the displacement is a maximum the pressure is a minimum.
Where the displacement is zero, the pressure is a maximum.
3 0
3 years ago
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