Select the sentences about the physical nature of light that are true. Check all that apply. Check all that apply. Blue light ha
1 answer:
Correct options:
- Blue light has a wavelength of 750 nm, the longest wavelength of the visible spectrum, while red light measures 500 nm. --> INCORRECT. In fact, blue light's wavelength is approximately 500 nm, and red light is around 750 nm, which represents the longest visible wavelength.
- Light is a form of electromagnetic radiation that consists of oscillating electric and magnetic fields. --> TRUE. Electromagnetic radiation consists of transverse waves characterized by electric and magnetic fields that oscillate at right angles to each other.
- Frequency is expressed in units of distance per second. --> INCORRECT. Frequency is quantified in Hertz (Hz), which reflects oscillations per second (.
- The closer the waves are together, meaning the longer the wavelength, the more energy they contain. --> INCORRECT. The energy of an electromagnetic wave is inversely related to its wavelength:
indicating that a longer wavelength equates to lower energy.
- Grass appears green due to its reflection of the wavelength associated with green light while absorbing others. --> TRUE. The perceived colors of objects correspond to the light they reflect, and other colors are absorbed by those objects.
- Light travels at 3.00×10^8 mph in a vacuum. --> INCORRECT. The units provided are wrong: the speed of light in a vacuum is .
- Electromagnetic radiation exhibits characteristics of wavelength, amplitude, and frequency. --> TRUE. Wavelength is the distance between two successive peaks, amplitude represents the greatest deviation of the wave from its resting position, and frequency indicates the number of oscillations each second.
- The variety of wavelengths present in white light accounts for the way we perceive colors in objects. --> TRUE. White light is comprised of multiple colors, and the colors we perceive depend on which are absorbed or reflected by an object.
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Answer:
a)
b)
c)
Explanation:
According to the problem, the distance from the building where the ball hits is 16m, and its final elevation exceeds the initial height by 8m.
With this information, we can compute the ball’s starting speed.
a) Let's first assess the horizontal trajectory.
(1)
This gives us our initial equation.
Next, we need to examine the vertical trajectory.
Utilizing in our first equation (1)
Now let’s solve for t.
The ball takes two seconds to reach the adjacent building, allowing us to compute its initial speed.
b) To determine the velocity magnitude just before impact, we must calculate both x and y components.
The computed velocity magnitude is:
c) The ball's angle is:
Answer:
(A) The tension's magnitude grows to four times the initial value, 4F.
Explanation:
When an object travels in a circular path, a centripetal force is exerted upon it. In this instance, the centripetal force acting on the stone can be represented by .
Here, m denotes the mass of the object
v is the velocity or speed of the object
r signifies the radius of the circular path
Importantly, the tension corresponds to the centripetal force.
Initially, the string completes one revolution each second, and subsequently, it accelerates to perform two revolutions in the same time frame. This signifies that the speed has increased twofold.
Applying our formula:F =
where F indicates the tension in the string
assuming the starting speed is v, after doubling it becomes 2v
Maintaining the circle's radius, we arrive at:
F=
From this equation, it's clear that the initial tension has quadrupled.
Consequently, the magnitude of the tension increases to four times its original value, 4F.