Long Test PhysicsWaves, Electromagnetic Spectrum, Half Life and Reflection-Refraction

Teacher Rugi

1. A ___________ is a vibratory disturbance. 2. Give three examples of waves.

a.__________________b.__________________c.__________________

3. A _______________ is a single vibratory disturbance that moves from one point to another point. 4. A periodic wave transfer ______. 5. In a longitudinal wave, the particles vibrate ________ to the motion of the wave. 6. In a transverse wave, the particles vibrate _________ to the motion of the wave. 7. The top of the wave is called the ________. 8. The bottom of the wave is called a _______. 9 __________ is the height if the wave from the rest position to the top of the wave. 10. An electric guitar is generating a sound of constant frequency. An increase in which sound wave Characteristic would result in an increase in loudness? ( wavelength or amplitude) 11. It is how long the wave is. 12. __________ is the number of waves that pass a point in a unit time. 13. The unit of frequency is ________ 14. A motor is used to produce 4.0 waves each second in a string. What is the frequency of the waves? ( 25 Hz or 4.0 Hz) 15. A physics student notices that 4.0 waves arrive at the beach every 20 seconds. The frequency of these waves is. ( 0.20 Hz or 5.0 Hz) 16. The time it takes for one wave to complete one vibration. 17. What is the frequency of a wave ii its period is 0.25 second? (12 Hz or 4.0 Hz) 18. If the frequency of a periodic wave is doubled, the period of the wave will be ____________ 19. A periodic transverse wave has an amplitude of 0.20 meter and a wavelength of 3.0 meters. If the frequency of this wave is 12 Hz, what is its speed? ( 36 m/s or 40 m/s) 20. A surfacing whale in an aquarium produces water wave crests having an amplitude of 1.2 meters every 0.40 second. If the water wave travels at 4.5 meters per second, the wavelength of the wave is ( 1.8m or 2.4 m) 21. The angle between the incident ray and the normal is called ___________. 22. The angle between the reflected ray and the normal is called __________. 23. This type of reflection happens when incident rays hitting a mirror (smooth surface) are parallel to each other and therefore the reflected rays are also parallel to each other. 24. This type of reflection when incident rays hit a rough surface. 25. The bending of light when it goes from one medium to a different medium is called ____________. 26. It is the longest wavelength as long as the football field and as short as football. ______________. 27. Extremely high frequency radiowave. ______________ 28. Wave length of 1nm – 780nm._______________ 29. The only part of the spectrum visible to the human eye._____________. 30. Higher frequency than the color violet.________________. 31. It has the ability to penetrate matter to produce images.____________. 32. Produced by changes in atomic nuclie.__________. 33. What are the two types of radiation. _______________ and _______________Problems:

1. If you start with 2.5 x 10 9 atoms of Sb-125, how much time will pass before the amount remaining is 3.5 x 10 6 atoms? The half-life of Sb-125 is 25.17 yrs.

2. The half-life of Zn- is 3.4 minutes. If one had 200 g at the beginning, how many grams be left after 10 minutes has elapsed?

3. After 30 days, 3.00 mg of an original 128 mg sample remain. What is the half-life of the sample?4. Calculate the wavelength of an IR if its frequency is 5 x 10 12 Hz.5. A colored light has a wavelength of 6.8 x 10-7 m.

a. Express this in nanometers, in micrometer, in picometer.b. Calculate its frequency using wave equation.

6. Ultraviolet radiation is recognized in 3 parts, each with its own wavelength so UVA is between 315-400 nm, UVB is between 280-315 nm and UVC is 100-280 nm. The ozone layer in the atmosphere mostly absorbs UV radiation in the frequency range 3.0 x 10 15 Hz. Which part of the UV radiation reach the Earth’s surface.