Trial on first two lectures of revision

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1) The ratio between the velocity of the red color in air to the velocity of the red color in water is …

2) The only light that cannot be used to obtain the interference fringes is ….

3) If the two waves have same frequency what are the characteristic must be the same for these wave ..

4) the dimensions of the light ray which may cause the visible light ray to diffract

5) An earthquake monitoring station has detected two types of earthquake waves of different speeds 6000 m/sec and 5000 m/sec where the time interval between them was 1 minute if the two types of waves are produced from the same source find the distance between the source and the station

6) The central fringes in the double slits experiment by Thomas Young is

7) If the ratio between the frequency of the voice of a man to that a girl is 7/9 the ratio between the speeds of their voices in air equal

8) In Young’s experiment to study the light interference, a monochromatic ray its wavelength 6000 A° was used forming fringes on an observing screen at distance (R) from the double slits and the distance between two successive bright fringes was (Δy1). If another monochromatic light its wavelength 4000A° is used and the distance between the double slits and the observing screen is doubled, the distance between two successive bright fringes becomes (Δy2), the ratio 𝚫𝐲𝟏 / 𝚫𝐲𝟐

9) When a school’s bell rings its sound reaches the ears of students in the form of ……. Waves

10) The total internal reflection for an incident light ray from an optically denser medium to an optically rarer medium occurs when the angle of incidence is ….

11) Hertz is the measuring unit for the frequency which of the following is equivalent unit …..

12) If the refractive index of water is 4/3 while alcohol is 3/2 calculate the refractive index from water to alcohol

13) If the two waves have same frequency what are the characteristic must be the same for these wave ..

14) A moving wave of a constant frequency travels between different media. If its wavelength in one medium is larger than its wavelength in the other medium by 10 cm so calculate the wavelength of the wave in the first medium (knowing that the ratio between the speeds of the wave in two media is (v1/v2=2/3)

15) The path difference in the 10th dark part is

16) If the refractive index of the diamond is 2.5 and refractive index of water is 1.33 then the relative refractive index from water to diamond

II. The distance between the centers of the compression and successive rarefactions

18 )The light ray doesn’t refract if it ….

19) A floating body on the water surface of a lake if the lake waves cause the frequency vibration of the body up and down 90 times in minute then the frequency of these wave equals

20)The distance between two successive points opposite in phase of a wave is 10 cm then the wavelength is

21)If speed of wave is doubled as it passes shallow water into deeper water its wavelength will be

22)Two bodies are vibrating, the first body makes 90 complete vibrations in 2 min and the second body makes 3 complete oscillations in one second so the ratio between their periodic times (T1/T2) ….

23)The optical fibers used in ….

24)Sound travel through air, the air particles …

25) which of the following is considered a transitional motion