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3 years ago

Which best explains why infrared waves are ineffective for treating cancer ?

Physics

2 answers:

Natali5045456 [20]3 years ago

8 0

If it is a multiple choice question is C. Infrared waves do not carry enough energy to kill cancerous cells.

Sever21 [200]3 years ago

7 0

Answer:

Since infrared waves are of lesser energy so it do not have sufficient energy to break the cancer cells

Explanation:

As we know that if we arrange the electromagnetic waves in decreasing order of energy then it is as following

1) Gamma rays

2) X rays

3) Ultraviolet rays

4) Visible light

5) Infrared waves

6) Microwaves

7) Radio waves

so here since energy of infrared waves as even smaller then visible light so it is not used for the treatment of cancer cells

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When a small object is launched from the surface of a fictitious planet with a speed of 52.9 m/s, its final speed when it is ver

NISA [10]

Answer:

The escape speed of the planet is 41.29 m/s.

Explanation:

Given that,

Speed = 52.9 m/s

Final speed = 32.3 m/s

We need to calculate the launched with excess kinetic energy

Using formula of kinetic energy

$K.E=\dfrac{1}{2}mv^2$

$K.E=\dfrac{1}{2}\times m\times(32.3)^2$

We need to calculate the escape speed of the planet

Using formula of kinetic energy

$\text{escape kinetic energy}=\text{launch kinetic energy}-\text{excess kinetic energy}$

$\dfrac{1}{2}mv^2=\dfrac{1}{2}mv^2-\dfrac{1}{2}mv^2$

$\dfrac{1}{2}\times v^2=\dfrac{1}{2}\times(52.9)^2-\dfrac{1}{2}\times(32.3)^2$

$v=\sqrt{2\times(\dfrac{1}{2}\times(52.9)^2-\dfrac{1}{2}\times(32.3)^2)}$

$v=41.29\ m/s$

Hence, The escape speed of the planet is 41.29 m/s.

4 0

3 years ago

Three objects lie in the x, y plane. Each rotates about the z axis with an angular speed of 5.58 rad/s. The mass m of each objec

QveST [7]

Answer:

a) V1=11.05m/s V2=92.07m/s V3=17.24m/s

b) KE = 16238.26J

Explanation:

For tangential speeds:

$V1 = \omega*R1=5.58*1.98=11.05m/s$

$V2 = \omega*R2=5.58*16.5=92.07m/s$

$V3 = \omega*R3=5.58*3.09=17.24m/s$

For the kinetic energy, it can be calculated as:

$KE=1/2*\omega^2*(I1+I2+I3)$

Where:

$I1 = m1*R1^2=5.46*1.98^2=21.4kg.m^2$

$I2 = m2*R2^2=3.64*16.5^2=990.99kg.m^2$

$I3 = m3*R3^2=3.21*3.09^2=30.65kg.m^2$

So,

$KE=1/2*5.58^2*(21.4+990.99+30.65)$

KE=16238.26J

4 0

3 years ago

Why will interference occur

den301095 [7]

Two waves interfere when they run into each other.

The barrier reflects waves that run straight into it. It acts as a wave source and sends wave pulses back up the page towards the incoming waves.

Imagine a loose string tied to a wall. Someone sends two consecutive pulses along the string towards the wall. The first pulse gets reflected right away. It will travel backward towards the person holding the string. Along its way, it will run into the second pulse. The two pulses will interfere. The wall will make the reflected pulse out of phase with the second one. They will end up creating a destructive interference.

So is the case with the water waves running into the barrier. The barrier will send incoming waves back toward where they came from. Reflected waves interfere with incoming ones.

7 0

3 years ago

TRUE FALSE Butter requires a great deal of friction to slide on a hot cookies tray?

Blababa [14]

Answer:

verdadero

Explanation:

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3 years ago

What effect do impurities have on the crystal lattice? Why does that result in the lowering of the melting point of a solid?

s344n2d4d5 [400]

Answer:

It reduces the melting point due to a defect in the arrangement of the crystal lattice.

Explanation:

The presence of impurities creates a disorderliness in the uniformity of the crystal structure. It lowers the melting point by a few degrees because it becomes easier to overcome the intermolecular force of attraction.

It makes the array of crystals disordered.

Lattice is a long chain three-dimensional arrangement of the molecules, atoms or ions in a crystal structure.

3 0

4 years ago