1- wave velocity is related to

a- period b-wavelength c-amplitude d-all of these
2- wave amplitude is related to
a- wave velocity b- frequency c- energy d-wave length
3-which of the following radiation has te smallest frequency?
a- infrared b- visible c- ultraviolet d-x-rays
4-light can travel to the earth from a distant star but sound cannot.why is it?
a- light is an electromagnetic wave and sound requires a medium
b- the sun does not make sound
c- light is a longitudinal wave and sound is a transverse wave
d-the statement is false both will travel in empty space
5- resonance occurs when
a- two different objects vibrate with different frequencies
b- two different objects produce beats
c- an object having certain natural frequency is set in vibration by second object vibrating at that frequency.
d- an object produces a sound.
6- when oscillator is driven in resonance,
a- there are no standing waves
b-all natural frequencies are present
c- there is maximum energy transfer
d- any driving frequency may be used.
7-imags of objects are formed by lenses because of
a- refraction b-diffraction c-internal reflectn d-all of these

8- complete destructive interference occurs for two waves of the same amplitude and frequency when the waves are out of phase by:
a- zero degree
b- 90 degrees
c- 180 degrees
d-360 degrees
9-what is the wavelength in meters of radio waves produced by a radio station with a frequency of 1400 KHz?
a- 2.1 X 10^7 m
b-2.1 X 10 ^12m
c- 4.23 X 10 ^14
d- 2.1 X 10^2m
10- what is the frequency in hertz of a sound wave( v=340 m/s) with wavelength of 0.20m?
a- 1.7 X 10^3 Hz
b- 17 X 10^3 Hz
c- 1.7 X 10^2
d- 68Hz
11- a series of ocean waves each 6.0m from crest to crest moving past an observer at a rate of 2.0 waves per second has what speed?
a-3 m/s b- 12 m/s c- 33 m/s d- 720 m/s
12- how many times greater is the speed of red light(700nm) than the speed of violet light(400nm) in a vacuum?
a- 1,100 nm b- 300 nm c- 175 times d- both have the same speed
13- how many times faster is the speed of light in vacuum than the speed of sound in air?
a- 10^6 times
b- 10^ -6 times
c- 300 X 10^6 times
d- 300 times
14- the speed of light in diamond is 1.24 X 10^8 m/s. what is the index of refraction of diamond?
a- 2.42 b-242 c- 0.41 d- 1.24

15- a particular material has an index of refraction of 1.25. what percent of the speed of light in vacuum is the speed of light in the material?
a- 125 %
b- 8%
c- 12.5 %
d- 80 %

16- an object is placed 8cm from a converging spherical lens. The general characteristics of the image for a lens with a focal length of f=12 cm.
a- real, inverted, and enlarged
b- virtual, upright, and enlarged
c- virtual, inverted and smaller
d- real , upright and smaller
17- a simple magnifying glass has a focal length of 6.0cm. an object is placed 4.0 cm from it. Give the characteristics of the image.

a- virtual, inverted and smaller
b- real, inverted and enlarged
c- virtual, upright and enlarged
d- real, upright and smaller

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The "work function", or the minimum energy needed to eject an electron from the metal, can be expressed in several different ways. As stated on the applet page, sodium has a work function of 2.75 eV.

1- The wave velocity is related to all of these: period, wavelength, and amplitude. To find the wave velocity, you can use the equation v = λ * f, where v is the velocity, λ is the wavelength, and f is the frequency.

2- The wave amplitude is related to neither wave velocity, frequency, nor wavelength. Instead, it is related to the energy of the wave. The amplitude represents the maximum displacement of particles in a wave. It does not affect the velocity, frequency, or wavelength of the wave.

3- The smallest frequency among the given options is d- x-rays. The frequency of electromagnetic waves increases as we move from radio waves (infrared) to visible light to ultraviolet and then x-rays.

4- The correct answer is a- light is an electromagnetic wave and sound requires a medium. Light can travel through a vacuum, such as space, because it is an electromagnetic wave. On the other hand, sound waves require a medium, such as air, water, or solid, to propagate. In the vacuum of space, there is no medium to carry sound waves, so they cannot travel.

5- Resonance occurs when an object with a certain natural frequency is set in vibration by a second object vibrating at that same frequency. The correct answer is c- an object having a certain natural frequency is set in vibration by a second object vibrating at that frequency.

6- When an oscillator is driven in resonance, there is maximum energy transfer. Resonance occurs when the driving frequency matches the natural frequency of the system, resulting in a maximum response or energy transfer. Therefore, the correct answer is c- there is maximum energy transfer.

7- Images of objects are formed by lenses because of refraction. Lenses are transparent objects that refract (bend) light rays as they pass through them. This refraction allows lenses to focus and form images. Therefore, the correct answer is a- refraction.

8- Complete destructive interference occurs when two waves of the same amplitude and frequency are out of phase by 180 degrees (or π radians). At this point, the crests of one wave align with the troughs of the other wave, resulting in destructive interference and the cancellation of the waves' amplitudes. Therefore, the correct answer is c- 180 degrees.

9- To find the wavelength of radio waves produced by a radio station with a frequency of 1400 KHz, we can use the wave equation v = λ * f. Rearranging the equation, λ = v / f. Here, the frequency f is given as 1400 KHz, which we need to convert to Hz by multiplying by 10^3. The speed of light, or wave velocity, in air or vacuum is approximately 3 x 10^8 m/s. Substituting these values, we get λ = 3 x 10^8 m/s / (1400 x 10^3 Hz). Simplifying the equation, we find λ ≈ 2.14 x 10^5 m, which can be approximated to 2.1 x 10^7 m. Therefore, the correct answer is a- 2.1 x 10^7 m.

10- To find the frequency of a sound wave with a given wave velocity (v = 340 m/s) and wavelength (λ = 0.20 m), we can use the wave equation v = λ * f. Rearranging the equation, f = v / λ. Substituting the given values, f = 340 m/s / 0.20 m = 1700 Hz, which can be written as 1.7 x 10^3 Hz. Therefore, the correct answer is a- 1.7 x 10^3 Hz.

11- The speed of waves can be calculated by multiplying the frequency by the wavelength. In this case, the distance between crests (wavelength) is given as 6.0 m, and the rate at which waves pass (frequency) is given as 2.0 waves per second. Multiplying the two values, we get the speed of the waves as 6.0 m/wave * 2.0 waves/s = 12 m/s. Therefore, the correct answer is b- 12 m/s.

12- The speed of light does not depend on the wavelength or color of light. In a vacuum, all colors of light travel at the same speed, which is approximately 3.00 x 10^8 m/s. Therefore, the speed of red light (700 nm) and violet light (400 nm) in a vacuum are both the same. Hence, the correct answer is d- both have the same speed.

13- The speed of light in a vacuum is approximately 3.00 x 10^8 m/s, while the speed of sound in air is approximately 343 m/s. Dividing the speed of light by the speed of sound, we get 3.00 x 10^8 m/s / 343 m/s ≈ 8.75 x 10^5. Simplifying this, the speed of light in vacuum is about 300,000 times faster than the speed of sound in air. Therefore, the correct answer is d- 300 times.

14- The index of refraction of a material can be calculated using the equation n = c / v, where n is the index of refraction, c is the speed of light in a vacuum (approximately 3.00 x 10^8 m/s), and v is the speed of light in the material. Rearranging the equation, v = c / n. Substituting the given speed of light in diamond as 1.24 x 10^8 m/s, we get v = 3.00 x 10^8 m/s / 1.24 x 10^8 m/s ≈ 2.42. Therefore, the correct answer is a- 2.42.

15- To find the percent of the speed of light in a material, we can use the equation (v / c) * 100%, where v is the speed of light in the material and c is the speed of light in a vacuum. Given that the index of refraction is 1.25, we can calculate the speed of light in the material as v = c / n = 3.00 x 10^8 m/s / 1.25 = 2.40 x 10^8 m/s. Dividing this by the speed of light in a vacuum (3.00 x 10^8 m/s) and multiplying by 100, we get (2.40 x 10^8 m/s / 3.00 x 10^8 m/s) * 100 ≈ 80%. Therefore, the correct answer is d- 80%.

16- Using a converging spherical lens with a focal length of 12 cm, an object placed 8 cm in front of the lens will produce a real, inverted, and enlarged image. Therefore, the correct answer is a- real, inverted, and enlarged.

17- A simple magnifying glass acts as a single converging lens. When an object is placed within the focal length of a converging lens, the image formed is virtual, upright, and enlarged. Therefore, the correct answer is c- virtual, upright, and enlarged.