SAUCE BY Lord of Dreams
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Voltage can be induced in a wire by
A: all of these
Law says that the Induced current is proportional to the change of magnetic flux
A: Faraday's
The power factor is the ratio of __________________ power to _________________
power. A: true and apparent
Voltage can be induced in a wire by__________.
A: all of these
Electromagnetic induction is change in ___________________.
A: magnetic flux
Which description best applies to Lenz's Law?
A: When a change in magnetic field occurs to a coil the direction of current goes in the in
the other direction to this change.
A magnet is moved in and out of a coil of wire connected to a high-resistance voltmeter. If
the number of coils doubles, the induced voltage ___________
A: doubles
A magnet can move in a coil of wire to produce electricity in which
system? A: Generator
What benefit is gained by the addition of the iron core in an electromagnet?
A: It makes a weak magnet stronger
What would happen if I move a bar magnet in and out of a coil of copper wire?
A: Electric current will flow through the wire
The period of a wave is
A: time required to complete one cycle
When frequency decreases, capacitive reactance _____.
A: increases
In a circuit containing resistance only, the voltage and current are with one
another. A: in phase
Which of the following is true of the current in a capacitive circuit? A:
It leads the voltage.
Battery is ________.
A: DC source
Current from a battery is _____________.
A: DC
An image that is formed at the back of the mirror is said to
be_______. A: virtual image
Current that is used by most household appliances____________.
A: AC
The current in an inductive circuit _____.
A: lags the voltage
X-ray photographs show softer tissue__________.
A: as dark, highly exposed areas.
Which of the following occurs as a light wave bends when it passes from one medium into
another?
A: refraction
Electromagnetic waves vary in _______.
A: wavelength and frequency.
To calculate the frequency of an electromagnetic wave, you need to know the speed of
the wave and its__________.
A: wavelength
Newton’s prism experiments showed that white sunlight is made up of__________.
A: all the colors of the visible spectrum.
Infrared rays have a shorter wavelength than__________.
A: radar waves.
Light acts like__________.
A: Both a wave and a particle
Which of the following occurs as light travels farther from its source?
A: Far from the source, photons spread over a larger area.
Cellular telephones utilize__________.
A: microwaves
What is the characteristic of image formed when given that u and f have the same value of
length?
A: real or virtual, image formed at infinity
A concave lens forms the image of an object such that the distance between the object
and image is 10 cm and the magnification produced is 1/The focal length of the lens will
be__________
A: 4.4 cm
An image is formed upside down in front of mirror and seems bigger by 2 times from the
actual size. What might be the type of mirror uses?
A: concave mirror
To determine the characteristics of image formed we need to a draw ray diagram that
uses_______.
A: at least 2 rays that overlap each other
When a ray of light enters a glass slab from air_______.
A: its wavelength decreases
A hollow convex lens of glass will behave like__________.
A: glass plate
Angle of minimum deviation is equal to the angle of prism A of an equilateral glass prism.
The angle of incidence at which minimum deviation will be obtained is __________ A:
60∘
Which statement is true about convex mirror?
A: image formed is virtual and diminished
A real image is formed by a convex lens, then it is put in contact with a concave lens
and again a real image is formed. This image is ______________
A: shift away from the lens system
The combination of two or more waves that result in a single
wave___________. A: interference
How loud or soft a sound is, is related to the _____________ of the
wave A: amplitude
Constructive interference will cause the wave to ___________.
A: Increase its displacement
In ________ interference, the energy of the combined wave is greater than the energy
of each of the two waves.
A: constructive
When a wave bends around a barrier or passes through an opening, it is
called__________. A: Diffraction
_____________ wave particles move left to right.
A: Longitudinal
Which wave behavior do noise cancelling headphones use?
A: destructive interference
If two sound waves differ in intensity, the wave that is more intense
sounds________ A: louder
What is interference?
A: occurs when two or more waves overlap and combine
occurs when two or more waves combine to produce a wave with a smaller
amplitude/energy.
A: Destructive interference
The full range of frequencies of electromagnetic radiation is called
______________. A: radio waves
The waves with the longest wavelengths in the electromagnetic spectrum are
__________. A: Infrared rays
To calculate the frequency of an electromagnetic wave, you need to know the speed of the
wave and its
A: wavelength
Which of the following occurs as light travels farther from its source?
A: The source gives off less light as photons move away from it.
Which of the following occurs as a light wave bends when it passes from one medium into
another?
A: constructive interference
X-ray photographs show softer tissue____________.
A: as invisible.
Electromagnetic waves vary in__________.
A: wavelength and frequency.
The visible light spectrum ranges between _____________.
A: television waves and infrared rays.
Light acts like _______
A: Both a wave and a particle
Infrared rays have a shorter wavelength than ____________.
A: Ultraviolet ray.
WEEK 18
When a nucleus undergoes nuclear decay by gamma rays, the atomic number of
the element _______.
A: remains the same
The process of the production of lighter nuclei from heavier nuclei is called
___________. A: fission
Negatively charged particles emitted from a nucleus at a high speed are
____. A: beta particles
The three types of nuclear radiation in increasing order of penetrating power are
____. A: alpha, beta, gamma
Radioactive materials have unstable___________.
A: nuclei
A helium nucleus with two protons and two neutrons is called a(n)
____. A: alpha particle
The type of radioactive particle that can be stopped by a sheet of paper is the
____. A: alpha particle
The most penetrating type of radiation is the ____.
A: gamma ray
What is Half-life?
A: The amount of time it takes for half the nuclei in a sample of the isotope to decay