Pulse type of modulation is applied to radio-controlled toys, therefore the correct answer is option D.
<h3>What is the frequency?</h3>
It can be defined as the number of cycles completed per second. It is represented in hertz and inversely proportional to the wavelength.
Toys controlled by remote control operate by emitting infrared radiation. These infrared rays have a frequency of 34–48 kilo Hertz.
Different types of modulations, such as frequency and amplitude modulation for transmitting and receiving video and music, are employed for other reasons.
Thus, the Pulse-type of modulation is applied to radio-controlled toys, therefore the correct answer is option D.
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"Light year" is a distance, not a speed. It's the distance light travels in one year, at the speed of 299,792,458 meters per second.
Answer:
Check Explanation.
The two statements given aren't true.
Explanation:
Although the question seems incomplete, I will address the concept of energy transfer during a wave's propagation.
The particles involved in wave's propagation move back and forth perpendicularly to the way the wave is moving, but do not move (at least, no significant movement is noticeable) in the direction of the wave. The particles ‘participate’ in the wave propagation by bumping into one another and transferring energy. This is exactly why energy can be transferred, although the average position of the particles doesn’t change.
So, the particles of the medium do not absorb energy from the atmosphere and do not significantly move from one location to another.
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Answer:
a = 1.1 m/s^2
Explanation:
let a be the acceleration of the astronaut, M be the mass of the earth and r be the radius of the earth.
from the information provide:
the distance r is the radius of the earth.
the distance ,d, the astronaut is from the surface of the earth and the only force acting on the astronaut is gravity, the astronaut accelerates with due to gravity only that is d = 3×r because we consider the earth center as the center of mass and gravity attracts object towards the center of mass.
then, we know that:
a = GM/d^2
= (6.67×10^-11)(5.972×10^24)/[(3×6371×10^3)^2]
= 1.1 m/s^2
Therefore, the Astronaut will be accelerating with an acceleration of 1.1 m/s^2 towards the earth.
