The megaphone is cupping the area around her mouth and it is like with your hands, if you cover around them the noise will be louder. It is because it is hollow and there isn't anything to block the noise through the megaphone.
Answer:
Frequency = 1,550Hz
Explanation:
To solve this we can use the equation:
(frequency = velocity/wavelength).
We are given the information that the wavelength is 22cm and the speed is 340m/s. The first step is to make sure everything is in the correct units (SI units), and to convert them if needed. The SI Units for velocity and wavelength are m/s and m respectively. This means we need to convert 22cm into meters, which we can do by dividing by 100, (as there are 100cm in a meter). 22/100 = 0.22m
Now we can substitute these values into the formula and calculate to solve:
Simplify to 3 significant figures:
f = 1,550Hz
(Which I believe is just below a G6 if you were interested)
Hope this helped!
Answer:
B: emits more light than a low luminosity star
Explanation:
Luminosity is an absolute measure of radiated electromagnetic power, the radiant power emitted by light scattering object. A star with large luminosity will have more measure of radiated electromagnetic power meaning it will emit more light than a low luminosity star. Luminosity has nothing to do with the color of star or distance.
Rest all options are wrong and only option b fits appropriate in the explaination above.
the relatively thick part of the earth's crust that forms the large landmasses. It is generally older and more complex than the oceanic crust.
Answer:
B. The image can either be virtual or real.
Explanation:
Concave mirrors can either produce real or virtual images. The image is upright given that it is virtual or real given that it is in front of the mirror. The images produced by the concave mirrors can also be reduced (in height), enlarged (in terms of size) or having same size as that of the object.
I hope this helps you understand about the images formed by concave mirrors.
<em>Have a nice studies.</em>