16. In any one material, all electromagnetic waves have the same A. amplitude. B

Question

16. In any one material, all electromagnetic waves have the same A. amplitude. B. wavelength. C. frequency. D. velocity. 17. The longest wavelength within the visible spectrum is _______ light. A. blue B. red C. violet D. orange 18. A material that transmits nearly all the light in a ray because it offers little resistance to the light is A. translucent. B. opaque. C. transparent. D. fluorescent. 19. The glow emitted by a substance exposed to external radiation is called A. bioluminescence. B. luminescence. C. phosphorescence. D. fluorescence. End of exam 20. When the image of a distant object is brought into focus in front of a person's retina, the defect is called A. chromatic aberration. B. farsightedness. C. nearsightedness. D. spherical aberration.

Explanation / Answer

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(16)

When the electromagnetic wave passes through any material its wavelength must change due to refractive index.

The velocity of the electromagnetic wave is,

Since, velocity contains the term wavelength it is also vary for different materials.

The frequency of the electromagnetic will not change when it changes from one medium to another medium that is frequency of electromagnetic wave is same in all materials.

The correct option is (C)

(17)

The red light has longest wavelength in the visible spectrum. It has 700 nm.

The correct option is (B)

(18)

A transparent material allows the light through it.

An opaque blocks the light.

A translucent is semi transparent material

The correct option is (C)

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