Question 1

The range of energies emitted by the Sun is most intense near the yellow-green wavelengths.

Accepted Answer

The Sun's spectrum peaks in intensity near the yellow-green part of the visible spectrum, around 500-570 nanometers, which is why the Sun appears yellowish when viewed from Earth. This peak corresponds to the maximum output of the Sun's radiation, making these wavelengths the most intense part of its spectrum.

Question 2

Ultraviolet light waves carry more energy than infrared light waves.

Accepted Answer

Ultraviolet light waves have shorter wavelengths than infrared light waves, and according to the electromagnetic spectrum, shorter wavelengths correspond to higher energy levels.

Question 3

When an electric stove element is hot enough, it gives off a dull red glow. When it cools to the point that it no longer glows, it will
A) emit only shorter wavelength energy.
B) emit the same wavelength as before, but with less energy.
C) emit only longer wavelength energy.
D) stop emitting energy altogether.

Accepted Answer

When an electric stove element cools to the point that it no longer glows visibly, it doesn't stop emitting energy but rather emits energy at longer wavelengths, which are in the infrared range and not visible to the human eye. This is consistent with the principle that objects at lower temperatures emit radiation at longer wavelengths.

Question 4

Which numbered arrow is the refracted ray indicated by?

A) 1
B) 2
C) 3
D) 4

Accepted Answer

The answer of Which numbered arrow is the refracted ray...

Question 5

What are the units of h in the equation E = hf?
A)

B)

C) J×s
D) W×m

Accepted Answer

The answer of What are the units of h in...

Question 6

The index of refraction for flint glass is 1.5. This means that
A) light travels faster in this substance than it does in vacuum.
B) the wavelength of light passing through glass is 1.5× longer as it is in vacuum.
C) the speed of light is slower in this substance than it is in vacuum.
D) a ray of light is refracted away from the normal as it passes from air into glass.

Accepted Answer

The index of refraction indicates how much slower light travels in a medium compared to vacuum. An index of 1.5 means light travels 1.5 times slower in flint glass than in vacuum.

Question 7

If one cuts a current carrying wire, the flow of electricity will spill out into the air.

Accepted Answer

Electricity does not "spill out" into the air when a current-carrying wire is cut. Instead, the electrical circuit is broken, stopping the flow of electricity.

Question 8

Consider an electrical transformer has 10 loops on its primary coil and 20 loops on its secondary coil. What is the current in the secondary if the current is the primary coil is 5.0 A?
A) 2.5 A
B) 5.0 A
C) 10.0 A
D) 20.0 A

Accepted Answer

The transformer's current ratio is inversely proportional to its turns ratio. Since the secondary coil has twice as many loops as the primary (20 vs. 10), the current in the secondary will be half of that in the primary (5.0 A / 2 = 2.5 A).

Quiz 2: Light and Electricity

The range of energies emitted by the Sun is most intense near the yellow-green wavelengths.

Ultraviolet light waves carry more energy than infrared light waves.

When an electric stove element is hot enough, it gives off a dull red glow. When it cools to the point that it no longer glows, it will

Which numbered arrow is the refracted ray indicated by? $Which numbered arrow is the refracted ray indicated by? A) 1 B) 2 C) 3 D) 4$

What are the units of h in the equation E = hf?

The index of refraction for flint glass is 1.5. This means that

If one cuts a current carrying wire, the flow of electricity will spill out into the air.

Consider an electrical transformer has 10 loops on its primary coil and 20 loops on its secondary coil. What is the current in the secondary if the current is the primary coil is 5.0 A?