Deck 2: Light and Electricity

Question 1

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

Answer 1

True

Question 2

Ultraviolet light waves carry more energy than infrared light waves.

Answer 2

True

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.

Answer 3

emit only longer wavelength energy.

Question 4

Which numbered arrow is the refracted ray indicated by?

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

Question 5

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

A)

B)

C) J×s
D) W×m

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.

Question 7

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

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