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quester [9]
2 years ago
13

There are two types of waves, mechanical and electromagnetic. Microwaves, infrared, and radio was are examples of electromagneti

c waves. Which statement is true about the speed of an electromagnetic wave?
A) It is not affected by changes in media.
B) It is slower in a vacuum than in a medium.
C) In a vacuum, its speed equals half the speed of light.
D) It slows down when it goes from a vacuum to a medium.
Physics
1 answer:
aivan3 [116]2 years ago
5 0

Answer:

The answer is D.

Explanation:

One explanation I can give you is that generally waves travel faster through denser medium because the particles are tightly packed together and so they can transfer energy faster. But to verify the answer, I used Process of Elimination because the other 3 answers are not true. Choice A is entirely true, wave speed depends on the medium it is travelling through, so there is no way choice A is correct. Choice B is wrong because for example if we take light(an EM wave), it travels at a constant speed of 3.0x10^8 m/s in a vacuum and in open space. So, that proves that air or vacuum do not affect the speed of the wave in another medium. Choice C is related to Choice B, we just proved the speed of light is constant everywhere whereas choice C says that in a vacuum the speed is halved. Good luck in your Physics class and I hope for your best!

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Transverse waves travel with a speed of 20 m/s on a string under a tension 0f 6.00 N. What tension is required for a wave speed
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Answer:

T_2=13.5\ N

Explanation:

Given that,

Speed of transverse wave, v₁ = 20 m/s

Tension in the string, T₁ = 6 N

Let T₂ is the tension required for a wave speed of 30 m/s on the same string. The speed of a transverse wave in a string is given by :

v=\sqrt{\dfrac{T}{\mu}}........(1)

T is the tension in the string

\mu is mass per unit length

It is clear from equation (1) that :

v\propto\sqrt{T}

\dfrac{v_1}{v_2}=\sqrt{\dfrac{T_1}{T_2}}

T_2=T_1\times (\dfrac{v_2}{v_1})^2

T_2=6\times (\dfrac{30}{20})^2

T_2=13.5\ N

So, the tension of 13.5 N is required for a wave speed of 30 m/s. Hence, this is the required solution.

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3 years ago
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kogti [31]

Answer:

see solution below

Explanation:

The given resistors are connected in series.

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