Unit 10 Physics: EM Radiation / Light Review
Name ____________________________
_____1) Which of the following types of electromagnetic radiation has the shortest wavelength?
A) x-rays
B) green light
C) infrared
D) radio
2) List the following types of electromagnetic radiation from highest frequency to lowest frequency:
ultraviolet, infrared, radio, microwave, gamma rays, red light, blue light, green light, violet light
3) During which wave interaction does the speed of light and wavelength change? ___________________
4) According to your physics formula chart, what is the speed of light? ________________________
____ 5) Which of the following would be considered an electromagnetic wave?
I. sound wave
II. water wave
III. ultraviolet wave
A) I, II, and III
B) IV only
C) II, III, and IV
IV. radio wave
D) III and IV
____ 6) What is the difference between a mechanical wave and a non-mechanical wave?
A) Mechanical waves require a medium for transfer while non-mechanical waves don’t require a medium.
B) Mechanical waves are only transverse while non-mechanical waves are transverse and longitudinal.
C) Mechanical waves include sound and light while non-mechanical waves include water waves.
D) Mechanical waves have a higher amplitude than non-mechanical waves.
____ 7) Name the wave interaction when light bounces in erratic directions off a page of a book.
A) refraction
B) Doppler effect
C) specular reflection
D) diffuse reflection
____ 8) Name the wave interaction when light passed into a new medium bending the light.
A) refraction
B) Doppler effect
C) specular reflection
D) diffuse reflection
_____ 9) Name the wave interaction when light bounces off a surface and travels in one direction.
A) refraction
B) Doppler effect
C) specular reflection
D) diffuse reflection
_____ 10)Which of the following wave interactions causes a change in speed, wavelength, and direction?
A) reflection
B) refraction
C) diffusion
D) Doppler effect
_____ 11) A white light ray travels from water to air at angle of 40o. In the air, the light ray will
A) speed up and bend away from the normal
B) speed up and bend towards the normal
C) slow down and bend away from the normal
D) slow down and bend toward the normal
____ 12) During refraction, if the light is bending towards the normal line then the light wave is
A) is moving faster than before
B) is moving slower than before
C) is moving at the same speed
D) has more energy than before
Use the following scenario to answer the next 4 questions. You are heading back to physics class from the bathroom.
After washing your hands, you decide to check out your good looks in the bathroom mirror and you start mulling over
physics concepts about mirrors.
13)
14)
15)
16)
What
What
What
What
wave interaction occurs when you look in the bathroom mirror?
type of image is produced by the bathroom mirror? (Real or Virtual)
is the size of the image produced by the bathroom mirror? (Enlarged, Same Size, Reduced)
is the orientation of the image produced by the bathroom mirror? (Upright or Inverted)
The following description are for a images formed with a convex lens. Match the following image descriptions with
the proper object location.
_______ 17) Virtual, upright and bigger
A) More than twice the focal length
_______ 18) No image formed
B) Twice the focal length away
________ 19) Real, inverted, enlarged
C) Located between twice the focal length and a
single focal length away
________ 20) Real inverted and same size
D)
Located at the focal length away
________ 21) Real inverted and reduced
E ) Located less than the focal length away
For the light properties, classify them as evidence as a wave or evidence as a particle:
22) polarization
______________________________
26) reflection _______________________
23) photoelectric effect ________________________
27) refraction _______________________
24) diffraction __________________________
28) interference ____________________________
25) Emission spectra _________________________
29) Calculate the distance of the image when the focal length of the lens is 13.5 cm and the distance to the object is
29.5 cm. (GUESS METHOD HELPS HERE!!!!!)
Diagram: (Given + Unknowns)
Equation:
Sub:
Solve:
____ 30) When light hits a hard object and bounces off at an angle, this wave interaction is called:
A) reflection
B) refraction
C) diffraction
D) resonance
_____ 31) When light wave bend because they are passing from medium to another medium, this wave interaction is
A) reflection
B) refraction
C) diffraction
D) resonance
_____ 32) Which of the following relationships are true about light.
A) Energy and frequency are inversely related frequency and wavelength are directly related.
B) Energy and frequency are directly related frequency and wavelength are directly related.
C) Energy and frequency are inversely related frequency and wavelength are directly related.
D) Energy and frequency are inversely related frequency and wavelength are directly related.
33a) An incident light ray (the arrow) is being refracted from less optically
dense medium to a more optically dense medium. On the picture to
the right, draw a normal line and draw an approximate refracted ray.
Normal
33b) Does the refracted ray bend further or closer to the normal than
the incident ray. ______________________________
Less Optically Dense
More Optically Dense
33c) When compared to the incidence light ray, is the reflected light
ray moving faster on slower than the incidence ray? .______________
34) A 1.0 cm tall object is placed 2.0 cm in front of a convex lens with a focal length of 4.0 cm. Draw a ray
diagram to locate the image. Draw the lens in the middle first. Then Label f and 2f.
Your drawing MUST be to scale and use a ruler.
Describe the image formed…. …. Real or virtual…….
Enlarged, Same Size or Smaller ….. Upright or Inverted…..
Convex Lens
35) Scenario 1: A ray of orange light comes in at 45o
angle and is reflected off a specular surface.
Draw the incident ray of orange light, the reflected ray
of orange light, the normal line, angle of reflection and
the angle of incidence.
36) Scenario 2: A ray of green light comes in at 45 o
angle and is reflected off a rough surface.
Draw the incident ray of green light coming in at 45o
angle and being reflected.
Type of Reflection
Type of Reflection
SPECULAR SURFACE
ROUGH SURFACE
_____ 37) The temperature outside is 105oF in Allen TX. Your dog is out of dog food and you need to walk a mile (the
battery in your car is dead) to get the closest grocery store to buy dog food. Which of the following t-shirt should you
wear to keep the coolest and EXPLAIN WHY!!!!
A) green t-shirt
B) blue t-shirt
C) white t-shirt
D) black t-shirt
Why?
38) What is the frequency of electromagnetic radiation with a wavelength of a 6.25 x 10-8 m?
Diagram: (Given + Unknowns)
Equation:
Substitute:
Solve:
_____ 39) What occurs when an electromagnetic wave a frequency of 4.8 x 10 15 Hz hits a sample of lead (Pb) with a
threshold frequency of 1.0256 x 1015 Hz?
A) Electrons are ejected instantaneously.
B) Electrons are absorbs instantaneously.
C) Electrons become polarized.
D) Actually nothing happens.
______ 40) Which of the following is true about the images formed by convex lens?
A)
B)
C)
D)
Real images and virtual images appear behind the lens.
Real images and virtual images appear in front of the lens.
Real images appear in front of the lens, while virtual images appear behind the lens.
Real images appear behind the lens, while virtual images appear in front of the lens.
_____ 41) Which of the following scenarios would produce a virtual upright image when using a convex lens?
A)
B)
C)
D)
A focal length of 10.0 cm and the object placed 5.0 cm away from the lens.
A focal length of 10.0 cm and the object placed 10.0 cm away from the lens.
A focal length of 10.0 cm and the object placed 15.0 cm away from the lens.
It is impossible to produce a virtual upright image with a convex lens.
____ 42) Which of the following scenarios would produce a real inverted image when using a convex lens?
A)
B)
C)
D)
A focal length of 10.0 cm and the object placed 5.0 cm away from the lens.
A focal length of 10.0 cm and the object placed 10.0 cm away from the lens.
A focal length of 10.0 cm and the object placed 15.0 cm away from the lens.
It is impossible to produce a real inverted image with a convex lens.
_____43) You are changing the frequency on your ultra low frequency radio from 300 Hz to 3,000 Hz. Describe what
happen to the wavelength with this frequency change?
A) An increase in wavelength
B) A decrease in wavelength
C) The wavelength stays constant
D) The wavelength decreases immediately, then increases.
44) You are changing the frequency on your ultra low frequency radio from 300 Hz to 3,000 Hz. Find the change in
wavelength with this frequency change?
Diagram: (Given + Unknowns)
Equation:
Subs
Solve: