Answer:
67. iv. The different colors of light do not travel at the same time is NOT true about the nature of light.
68. d. As the wavelength increases, the frequency decreases.
69. 1. Gamma ray 2. X-ray 3. UV rays 4. Light 5. Infrared 6. Microwave 7. Radio wave arranged according to decreasing frequency.
70. A 1234567 arranged according to decreasing wavelength.
71. b. It has the longest wavelength and lowest frequency.
72. b. Shadows are a proof that light travels in a straight line.
67. i (a)
68. iv (d)
69. b
70. b
71. b
72. a
Explanation:
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Answers & Comments
Answer:
67. iv. The different colors of light do not travel at the same time is NOT true about the nature of light.
68. d. As the wavelength increases, the frequency decreases.
69. 1. Gamma ray 2. X-ray 3. UV rays 4. Light 5. Infrared 6. Microwave 7. Radio wave arranged according to decreasing frequency.
70. A 1234567 arranged according to decreasing wavelength.
71. b. It has the longest wavelength and lowest frequency.
72. b. Shadows are a proof that light travels in a straight line.
Answer:
67. i (a)
68. iv (d)
69. b
70. b
71. b
72. a
Explanation: