A traveling wave has wavelength 0.50 m, speed 20 m/s. Find the wave frequency.

Answers

Answer 1

Answer: Frequency = (speed) / (wavelength) = 20 / 0.5 = 40 per second = 40 Hz.

Answer 2

Answer: $f=(v)/(\lambda)$ where $f$ is frequency, $v$ is speed and $\lambda$ is wavelength. So f=20/0.5=40. The unit is 1/s or Hz.

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Please help me! Ill give brainliest who helps me first!!!!What is one difference between mixtures and pure substances?
A. mixtures can be physically separated
B. mixtures are made of one type of atom
C. pure substances have no chemical bonds
D. pure substances can be physically separated

Answers

i think it’s A hope this helps

Mixtures can be physically separated (I believe)

Which statements describe characteristics of all liquids? Check all that apply. Liquids have the ability to change shape. Liquids flow, even with some resistance. Liquids have definite volume. Liquids expand to fill containers. Liquids have molecules that slip past each other.

Answers

Answer;

Liquids have the ability to change shape.
Liquids flow, even with some resistance.
Liquids have definite volume
Liquids have molecules that slip past each other.

Explanation;

Liquids are one of the three states of matter, others being solids and gases.
Liquids are characterized by particles that are apart as compared to solid particles which are very closely packed, however they are still in contact unlike the case of gaseous particles.
Liquids have a definite volume but an indefinite shape, thus they occupy the volume of the container they are put.
Additionally, they are capable of flowing and take any shape. This is due to the presence of inter-molecular forces which allow the molecules to slide past each other freely.

answer:

liquids have he ability to change shape

liquids flow even with some resistance

liquids have a definite volume

liquids have molecules that slip past each other

_____ kilometers per second is the approximate speed of light.a. 300
b. 3,000
c. 30,000
d. 300,000

Answers

300,000 kilometers per second is the approximate speed of light.

How much net force is needed to accelerate a 15 kg mass at 2.8 m/s^2

Answers

Refer to the 2th Law of Newton

F = m. a

F = 15 x 2.8 = 42 N

two truckers are traveling directly away from each other at the same speed. If one trucker sounds her horn at a frequency of 206 Hz, and the other trucker hears a frequency of 189 Hz, determine the speed of the trucks. Use the speed of sound as 343 m/s. m/s

Answers

Answer:

v' = 14.76 m/s

Explanation:

given,

frequency of the one truck = 206 Hz

apparent frequency ,f' = 189 Hz

speed of sound, v = 343 m/s

speed of observer (v_o)and source (v_s) = v'

now, using Doppler's effect

$f' = (v-v_o)/(v+v_s)\ f$

$f' = (v- v')/(v+v')\ f$

$189 = (343- v')/(343+v')\ 206$

$0.9174= (343- v')/(343+v')$

314.69 + 0.9174 v' = 343 - v'

1.9174 v' = 28.30

v' = 14.76 m/s

hence, the speed of the truck is equal to 14.76 m/s

Parallel light waves hit the surface of a still lake and reflect in the same direction. Which interaction of light and matter does this illustrate?

Answers

Parallel light waves hit the surface of a still lake and reflect in the same direction and the interaction of light and matter that it illustrates is called regular reflection. Regular reflection occurs whenever the reflecting surface is very smooth. The surface of the still lake is smooth. I hope the answer helps you.

Answer:

regular reflection

Explanation:

Gradpoint

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