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klio [65]
3 years ago
14

I NEED HELP PLEASE, THANKS! :)

Physics
1 answer:
Yuliya22 [10]3 years ago
6 0

Answer:

Radio waves have a wavelength between 10^{-9}m and 10^{-12}m

While,

X rays have a wavelength between 1m and 10km.

=> It is one of the condition of diffraction that the obstacle (coming in the way) must be comparable with the size of the wavelength.

=> This shows, that radio waves have a wavelength which is comparable with the size of buildings and can really easily diffract through it

=> While, X-rays are big enough to diffract through the wall.

So, if an X-ray technician stands behind a wall during the use of her machine, she will remain safe.

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A rock with density 1900 kg/m3 is suspended from the lower end of a light string. When the rock is in air, the tension in the st
wel

Answer:

the tension T2 when the rock is completely immersed is T2 =  29.05 N

Explanation:

from Newton's second law

F= m*a

where F= force , m= mass , a= acceleration

when the rock is suspended ,a=0 since it is at rest. Then

T1 - m*g = 0 , T1= tension when suspended in air , g= gravity

assuming constant density of the rock

m= ρ rock *V , where  ρ rock = density of the rock , V= volume

thus

T1= m*g = ρ rock *g*V

V=  T1/(ρ rock *g)

when the rock is submerged in oil , it receives an upward force that equals the weight of the volume of displaced oil (V displaced). Since it is completely submerged the volume displaced is the volume of the rock V=Vdisplaced  

When the rock is at rest , then

F= m*a=0

T2 + ρ oil *g*V displaced - ρ rock *g*V  =0

T2 = ρ rock *g*V - ρ oil *g*V = g*V (ρ rock - ρ oil)

T2 = g*V (ρ rock - ρ oil) = T1/(ρ rock *g) *g * (ρ rock - ρ oil)

T2 = T1 * (ρ rock - ρ oil)/ρ rock

replacing values

T2 = 48 N * (1900 kg/m3- 750 kg/m3)/ 1900 kg/m3 = 29.05 N

T2 =  29.05 N

3 0
3 years ago
Calculate the velocity of a wave that has a frequency of 60 Hz and wavelength of 2.0 m/s
mote1985 [20]

Answer:We have , a relation in frequency f and wavelength  λ of a wave having the velocity v as ,

           v=fλ ,

given f=60Hz , λ=20m ,

therefore velocity of wave , v=60×20=1200m/s

3 0
3 years ago
Which square (A, B, C, or D) represents the repeating subunit of the polymer shown?
Yuri [45]
It would be C my dude.
9 0
2 years ago
Read 2 more answers
Venus is sometimes called:_____.
ANEK [815]

Venus is sometimes called the evening star.

<h3>What is a star?</h3>

A star is an astronomical object made up of a luminescent plasma spheroid that is held together by gravity. However, because to their enormous distances from Earth, many additional stars that are visible to the unaided eye at night seem like stationary points of light. The brightest stars have a variety of names, and the most notable ones have been grouped into constellations and asterisms. In order to identify known stars and establish standard stellar designations, astronomers have put together star catalogues. 1022–1024 stars are thought to be present in the observable universe. All individual stars outside of the Milky Way galaxy, for example, are invisible to the human eye from Earth.

To learn more about star, visit:

brainly.com/question/11624159

#SPJ4

6 0
1 year ago
The work function of cesium is 1.96 eV. If radiation of wavelength 4.00 × 10^2 nm is incident on the surface, find the kinetic e
nata0808 [166]
I have a note here that might help you solve the problem on your own:

According to the law of conservation of energy 

The energy of the photon is used in overcoming the workfunction of the metal, and the excess energy goes as the kinetic energy of the electron. 

<span>Photon Energy = Work function of Cs + KE of electron 
</span>

I hope my guide has come to your help. God bless and have a nice day ahead!
8 0
2 years ago
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