Answer:
Explanation:
When a ray of light passes through denser medium to rarer medium and then after refraction it comes back into the denser medium, the phenomenon is called total internal refraction.
There are two necessary conditions for the total internal refraction.
(1) The refraction takes place g=from denser medium to rarer medium.
(2) The angle of incidence in the denser medium should be more than the critical angle for that pair of media.
The wavelength of the water wave is 15 m.
<h3>What is wavelegth?</h3>
Wavelength is the distance of a complete cycle traveled by a wave.
To calculate the wavelength of the wave, we use the formula below.
Formula:
- v = λ/T.................Equation 1
Where:
- v = velocity of wave
- T = period
- λ = wavelength.
make λ the subject of the equation
- λ = vT............... Equation 2
From the question,
Given:
Substitute these values into equation 2
Hence, The wavelength of the water wave is 15 m.
Learn more about wavelength here: brainly.com/question/10750459
Answer: 207 W
Explanation: I assumed here that the object is moved vertically. If that is the case, the work done on the object is equal to its change in gravitational potential energy:
where
m = 47 kg is the mass of the object
g = 9.8 m/s^2 is the acceleration of gravity
is the change in height
Substituting,
Now we can calculate the power used, which is given by
Hope this helps I'm sorry if i'm wrong but I tried :(
Answer: option B. 1.0 × 10⁹ Hz
Explanation:
The speed, s, of a wave, equals the product of its frequency, ν, times its wavelength, λ:
As the question states, the speed of an electromagnetic wave is a constant, c, equal to 3.0 × 10⁸ m/s.
Substituting this constant in the equation for the speed of the wave, you get:
From that equation, you can solve for the frequency to show the inverse realation of frequency and wavelength:
Now, you just have to substitute values and compute:
- ν = c / λ = 3.0 × 10⁸ m/s / 0.3m = 10. × 10⁸ Hz = 1.0 × 10⁹ Hz
1. The answer is letter D. Position 4. The distance between the two allows the magnet bars to repel against each other.2. The answer is A. it decreases. Once two postitively charge bars are near each other, their force will increase but once they are apart, their force decrease.
