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Nady [450]
3 years ago
7

Which of the following is/are true? Electromagnetic waves are created by accelerating charges. Electromagnetic waves are transve

rse waves. Electromagnetic waves consist of time-varying electric and magnetic fields that are mutually perpendicular. Electromagnetic waves move at the speed of light in a vacuum. All of the above are true.
Physics
1 answer:
Vikki [24]3 years ago
4 0

Answer:

All of the above are true.

Explanation:

(a). true  

whenever  charge particle  move back and froth from its mean position then it will produce oscillating electric and magnetic fields, . so an em wave can be obtain by accelerating charge

(b). true

the electric field and the magnetic field have vibrations in the perpendicular direction along  the motion of the wave  so electromagnetic wave is a transverse wave. therefore, the EM wave is a Transverse wave

(c) true .

The Electromagnetic wave consists of the two mutually perpendicular electric and magnetic fields  and also both fields are  perpendicular to the direction of propagation of the wave.

(d) true .

An electromagnetic wave  carry  energy through  vacuum with a speed   of 3 \times 10^8 m/s  

   so , all of the above are true.

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Larry was told that a certain muscle cream was the newest best thing on the market and claims to double a person’s muscle power
Soloha48 [4]

Answer:

Person in the Control group: SpongeBob

Independent variable: Muscle cream

Dependent variable: Amount of muscle power

Larry's conclusion should conclude that the MUSCLE CREAM double a person’s muscle power when used as part of a muscle-building workout.

Explanation:

Independent variable is the variable that is changed or manipulated by the experimenter in an experiment. In this experiment, the MUSCLE CREAM is the variable being changed for the groups i.e. Patrick and SpongeBob. Hence, the MUSCLE CREAM is the independent variable.

The dependent variable is the variable that responds to changes made to the independent variable. In this experiment, the dependent/responding variable is the AMOUNT OF MUSCLE POWER.

Control group is the group of an experiment that does not receive the experimental variable (muscle cream). In this experiment, the person that does not receive the experimental variable is SpongeBob i.e. was lathered with the regular lotion.

Larry, who is the one conducting the experiment, should conclude that MUSCLE POWER doubles a person’s muscle power when used as part of a muscle-building workout.

3 0
3 years ago
A testing instrument that's used to measure electrical signals in a circuit and display them as waveforms on a screen is called
disa [49]
A testing instrument that's used to measure electrical signals
in a circuit and display them as waveforms on a screen is called
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3 years ago
What is the frequency of a pressure wave of wavelength 2.5 m that is traveling at 1400 m/s?
-BARSIC- [3]
The relationship between the speed, the frequency and the wavelength of a wave is given by:
f= \frac{v}{\lambda}
where
f is the frequency
v is the speed of the wave
\lambda is its wavelength

for the pressure wave in this problem, \lambda=2.5 m and v=1400 m/s, therefore its frequency is
f= \frac{v}{\lambda}= \frac{1400 m/s}{2.5 m}=560 Hz
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3 years ago
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