PHY-102: Wave, Sound, and Light Exercises week 5 ALL ANSWERS 100% CORRECT FALL-2021/2011 SOLUTION GUARANTEED GRADE A+
PHY-102: Wave, Sound, and Light Exercises week 5 ALL ANSWERS 100% CORRECT FALL-2021/2011 SOLUTION GUARANTEED GRADE A+

PHY-102: Wave, Sound, and Light Exercises week 5

ALL ANSWERS 100% CORRECT FALL2021/2011 SOLUTION GUARANTEED GRADE

A+

Complete the following exercises.

1. What is the source of all waves?

Waves are begun from the vibrations of moving items, or it could be because of the

exchange of vitality. As a rule, hotspot for every one of the waves is the vibration of

moving items.

2. A water wave vibrates up and down four times each second, the distance between two

successive crests is 5 meters, and the height from the lowest part to the highest part of the

wave is 2 meters.

a. What is the frequency of the wave in hertz?

Frequency is characterized as the quantity of cycles every second. As referenced

in the given data that, wave vibrated 4 times each second, henceforth the

frequency of the wave will be 4Hz.

b. What is the period of the wave in seconds?

Timespan is the time taken by one wave to finish its cycle and is the equal of

frequency. Consequently, the timeframe of the wave will be ¼=0.25 seconds.

c. What is the speed of the wave in meters per seconds?

The connection between the speed, frequency and wavelength is given as pursues,

v= f λ Where f is the frequency of wave, which is 4Hz for this situation. The

wavelength of the wave is the separation between to back to back coverings or

troughs of wave, which is 5m for this situation. Subsequently the speed of wave

will be v= f λ =(4)(5)=20ms−1

d. What is the amplitude of the wave in meters?

Amplitude is the half of the tallness between the covering and trough of the wave, for

this situation the stature between the outside layer and trough is 2m, henceforth the

amplitude of the wave is 1m.


3. When you sit in the stands at a baseball stadium, you will hear the crack of the bat a short

time after you see the batter hit the ball. Explain. Siting in the stands at a baseball arena,

one hears bat hitting the ball a short-lived timeframe after he see the ball hitting the bat.

This occurs because of certainty about the distinction in speed of light and speed of sound

in a similar medium (air for this situation). As the speed of light is 300000 Km/sec and

the speed of sound in air is around 332 m/sec. So, the speed of light is a lot quicker than

the speed of sound noticeable all around, that is the motive we first see the ball hitting the

bat and after short defer we hear that hit.

4. Why is the moon sometimes described as silent?

Moon is occasionally portrayed as quiet since it has no climate and henceforth no wind,

water or climate to make any sort of sound. Moreover, the moon encompassing has no

vehicle for the sound to travel (Sound cannot go through space). In this way, moon is

some of the time suggested as quiet

5. You are hiking in a canyon and you notice an echo. You decide to let put a yell and

notice it took 2 seconds before you heard the echo of your yell. How far away is the

canyon wall that reflected your yell? As the speed of sound in air at ordinary climatic

conditions is around 340 m/s, thus the utilizing the s=vt relationship the separation among

you and ravine divider will be,(340)(1)=340m Time is taken as 1 sec, since 2 seconds are

the complete time that sound took to venture out from mouth to divider and coming to

back to you after reflection. That is the reason half of the time is taken.

6. Explain how the Doppler effect is used by the police to measure the speed of a car.

Doppler's effect is a significant marvel that relates the frequencies of waves from two

moving articles. It expresses that when an article is pushing toward or away from the

wellspring of waves the recurrence of waves got at source will adjust moderately after

reflection from the item. An alike idea is utilized in the police radar to quantify the speed

of vehicle. A police radar radiates the microwaves toward vehicle moving, the waves

reflects to radar from the vehicle and the change in recurrence is noted down. From the

difference in reappearance, the speed of vehicle is estimated.

7. The light from the sun has higher frequencies from one side of the sun than from the

other side. What does that tell you about the sun? The data expressed in the inquiry

prompts the way that the sun is pivoting that is the reason two distinct surfaces of sun

gives two unique frequencies. The outside of sun moves towards the earth moves the light

towards higher recurrence, then again, surface of sun moving from the earth moves the

light towards the lower recurrence.

8. What is the source of all electromagnetic waves?

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