RIO SALADO PHYSICS 112 FINAL EXAM STUDY
QUESTIONS WITH 100% CORRECT ANSWERS
| BRAND NEW VERSION
1. Which of the following is a true statement?
A) Electric fields direct away from both positive and negative charges.
B) Electric fields direct towards both positive and negative charges.
C) Electric fields direct away from positive charges and towards negative
charges.
D) Electric fields direct towards positive charges and away from negative
charges. - ANSWER C) Electric fields direct away from positive
charges and towards negative charges.
2. A particular electromagnetic wave has a frequency of 5×10^17 Hz. What is
the wavelength of the wave?
A. 6×10^−10 m
B. 3×10^8 m
C. 1.7×10^9 m
D. 1.5×10^26 m - ANSWER Wavelength = c/f =
3*10^8/5*10^17
Answer: A. 6×10^−10 m
,3. The length of a linear broadcasting antenna is oriented in the y plane. A
linear receiving antenna should be oriented in the:
A. Z plane.
B. X plane.
C. Y plane.
D. The receiving antenna cannot be linear if the broadcasting
antenna is also linear. - ANSWER Answer: C. Y plane.
4. Which of the following is a true statement?
A. Induced emf is proportional to flux.
B. Induced emf is proportional to the rate of change of flux.
C. Induced emf is not related to flux.
D. EMF is only caused by electrical effects (not magnetic). -
ANSWER Answer: B. Induced emf is proportional to the rate
of change of flux.
5. What is the peak electric field strength of an EM wave if the peak intensity
of the wave is 5000 W/m^2
A. 1371 N/C
B. 1.89×10^6 N/C
C. 3.76×10^6 N/C
D. 1940 N/C - ANSWER Answer: A. 1371 N/C
6. The primary difference between x-ray waves and radio waves is:
A. X-ray waves are faster.
B. X-ray waves are longer.
C. X-ray waves are higher frequency.
D. more than one of the above. - ANSWER Answer: C. X-ray
waves are higher frequency.
7. What is the intensity of an electromagnetic wave that delivers 3000 joules of
energy to a 0.5 m^2 area every 3.0 sec?
A. 6000 W/m^2
, B. 1500 W/m^2
C. 18000 W/m^2
D. 2000 W/m^2 - ANSWER P = E/t = 3000/3 = 1000 W
I = P/A = 1000/.5 = 2000 W/m^2
D. 2000 W/m^2
8. The reason why humans cannot see infrared waves is because
A) the waves are too short for human eyes to detect.
B) the waves are too long for human eyes to detect.
C) the waves are too fast for human eyes to detect.
D) human eyes cannot detect electromagnetic waves. - ANSWER B) the
waves are too long for human eyes to detect.
9. The speed of an electromagnetic wave depends on
A) its frequency of wave oscillations.
B) its wavelength.
C) both of the above.
D) none of the above. - ANSWER D) none of the above.
, 10.Which of the following statements regarding radio waves and sound waves
is accurate?
A. Sound waves are transverse waves.
B. Sound waves and radio waves travel at approximately the
same speed.
C. Neither sound waves nor radio waves can travel through
water.
D. None of the above statements are accurate. - ANSWER
Answer: D. None of the above statements are accurate.
11.A maximum peak in an oscillating magnetic field occurs at some time t. At
the same time t, the electric field will experience:
A. a maximum peak.
B. a minimum peak.
C. a zero strength field.
D. none of the above. - ANSWER Answer: C. a zero strength
field.
12.What is the peak magnetic field strength of an EM wave if the peak electric
field strength is 3500 N/C?
A. 3500 T
B. 1.2×10^−5 T
C. 8.5×10^4 T
D. None of the above - ANSWER Bpeak=3500/3*10^8
Answer: B. 1.2×10^−5 T
13.Wave intensity is defined as the:
A. energy a wave delivers to a certain area.
B. rate of energy delivered to a certain area.
C. amplitude of an electromagnetic wave at a certain area.
QUESTIONS WITH 100% CORRECT ANSWERS
| BRAND NEW VERSION
1. Which of the following is a true statement?
A) Electric fields direct away from both positive and negative charges.
B) Electric fields direct towards both positive and negative charges.
C) Electric fields direct away from positive charges and towards negative
charges.
D) Electric fields direct towards positive charges and away from negative
charges. - ANSWER C) Electric fields direct away from positive
charges and towards negative charges.
2. A particular electromagnetic wave has a frequency of 5×10^17 Hz. What is
the wavelength of the wave?
A. 6×10^−10 m
B. 3×10^8 m
C. 1.7×10^9 m
D. 1.5×10^26 m - ANSWER Wavelength = c/f =
3*10^8/5*10^17
Answer: A. 6×10^−10 m
,3. The length of a linear broadcasting antenna is oriented in the y plane. A
linear receiving antenna should be oriented in the:
A. Z plane.
B. X plane.
C. Y plane.
D. The receiving antenna cannot be linear if the broadcasting
antenna is also linear. - ANSWER Answer: C. Y plane.
4. Which of the following is a true statement?
A. Induced emf is proportional to flux.
B. Induced emf is proportional to the rate of change of flux.
C. Induced emf is not related to flux.
D. EMF is only caused by electrical effects (not magnetic). -
ANSWER Answer: B. Induced emf is proportional to the rate
of change of flux.
5. What is the peak electric field strength of an EM wave if the peak intensity
of the wave is 5000 W/m^2
A. 1371 N/C
B. 1.89×10^6 N/C
C. 3.76×10^6 N/C
D. 1940 N/C - ANSWER Answer: A. 1371 N/C
6. The primary difference between x-ray waves and radio waves is:
A. X-ray waves are faster.
B. X-ray waves are longer.
C. X-ray waves are higher frequency.
D. more than one of the above. - ANSWER Answer: C. X-ray
waves are higher frequency.
7. What is the intensity of an electromagnetic wave that delivers 3000 joules of
energy to a 0.5 m^2 area every 3.0 sec?
A. 6000 W/m^2
, B. 1500 W/m^2
C. 18000 W/m^2
D. 2000 W/m^2 - ANSWER P = E/t = 3000/3 = 1000 W
I = P/A = 1000/.5 = 2000 W/m^2
D. 2000 W/m^2
8. The reason why humans cannot see infrared waves is because
A) the waves are too short for human eyes to detect.
B) the waves are too long for human eyes to detect.
C) the waves are too fast for human eyes to detect.
D) human eyes cannot detect electromagnetic waves. - ANSWER B) the
waves are too long for human eyes to detect.
9. The speed of an electromagnetic wave depends on
A) its frequency of wave oscillations.
B) its wavelength.
C) both of the above.
D) none of the above. - ANSWER D) none of the above.
, 10.Which of the following statements regarding radio waves and sound waves
is accurate?
A. Sound waves are transverse waves.
B. Sound waves and radio waves travel at approximately the
same speed.
C. Neither sound waves nor radio waves can travel through
water.
D. None of the above statements are accurate. - ANSWER
Answer: D. None of the above statements are accurate.
11.A maximum peak in an oscillating magnetic field occurs at some time t. At
the same time t, the electric field will experience:
A. a maximum peak.
B. a minimum peak.
C. a zero strength field.
D. none of the above. - ANSWER Answer: C. a zero strength
field.
12.What is the peak magnetic field strength of an EM wave if the peak electric
field strength is 3500 N/C?
A. 3500 T
B. 1.2×10^−5 T
C. 8.5×10^4 T
D. None of the above - ANSWER Bpeak=3500/3*10^8
Answer: B. 1.2×10^−5 T
13.Wave intensity is defined as the:
A. energy a wave delivers to a certain area.
B. rate of energy delivered to a certain area.
C. amplitude of an electromagnetic wave at a certain area.
