1.) What is the wavelength of radar waves with the frequency of 6.0 x 10^10 Hz?
ID: 2303300 • Letter: 1
Question
1.) What is the wavelength of radar waves with the frequency of 6.0 x 10^10 Hz? a.0.0010 m b.0.010 m c.0.050 m d.0.0050 m
2.) If a light ray strikes a flat mirror at an angle of 30 degrees from the normal, the ray will be reflected at an angle of a.30 degrees from the mirror's surface b.60 degrees from the mirrors surface c.60 degrees from the normal d.90 degrees from the normal.
3.) a concave mirror with a focal length of 10.0 cm creates a real image 30.0 cm away on its principle axis. how far from the mirror is the corresponding object? a.20 cm b.15 cm c.7.5 cm d.5.0 cm
4.) which of the following is not a primary subtractive color? a.yellow b.cyan c.magenta d.blue
5.) when a light ray moves from air into glass, which has a higher index of refraction, its path is a.bent toward the normal b. bent away from the normal c. parallel to the normal d. not bent
6.)how many focal points and focal lengths do converging and diverging lenses have? a.two, one b.one, two c.one, one d.two, two
7.) if atmospheric refraction did not occur, how would the apparent time of sunrise and sunset be changed? a.both would be later b.both would be earlier c.sunrise would be later, and sunset would be earlier d.sunrise would be earlier, and sunset would be later
8.) interference effects observed in the early 19th century were instrumental in supporting a concept of the existence of which property of light? a.polarization b.particle nature c.wave nature d.electromagnetic character
9.)a diffraction grating that contains 650 472 lines/m is illuminated by monochromatic light (lambda = 632.8 nm) from a helium- neon laser directed perpendicular to the surface of the grating. at what angles would one observe the first-order and second-order maxima? a. theta1=2.358 degrees; theta2=4.719 degrees b.theta1=24.30 degrees; theta2=55.38degrees c.theta1=29.37degrees;theta2=55.38degrees d.theta1=55.38degrees;theta2=83.078degrees
10.) the acronym laser stands for light amplification by _____ emissions of radiation. a.similar b.simultaneous c.spontaneous d.stimulated
11.) both insulators and conductors can be charged by a.grounding b.induction c.polarization d.contact
12.) when two point charges are moved farther apart, what is true about their resulting electric and gravitational forces? a.both forces stay the same b.gravitational force stays the same but electric force increases c.gravitational force increases but electric force stays the same d.both forces decrease
13.) Electric field strength depends on a.charge and distance b.charge and mass c.coulomb constant and mass d.elementary charge and radius
14.) when a positive charge moves in the direction of the electric field, what happens to the electrical potential energy associated with the charge? a.it increases b.it decreases c.it remains the same d.it sharply increases, and then decreases.
15.) a parallel plate capacitor has a capacitance of C F. If the area of the plates is doubled while the distance betwenn the plates is halved, the new capacitance will be a.4C b.2C c.C/2 d.C/4
16.) the energy gained by electrons as they are accelerated by an electric field is a.greater than the average loss in energy due to collisions b.equal to the average loss in energy due to collisions c.less than the average loss in energy due to collisions d.not affected by the gain in energy due to collisions
17.) your electricity is delivered and measured in kilowatt-hours, kW*h. This quantity can be converted to which other unit that measures energy? a.pascals b.joules c.newtons d.watts
18.) the batteries in a digital alarm clock provide a terminal voltage of 9 V. What is the potential difference across the entire clock circuit? a.4.5 V b.18.0 V c.9.0 V d.6.0 V.
19.) two resistors having the same resistance value are wired in parallel. How does the equilvalent resistance compare to the resistance value of a single resistor? a.the equivalent resistance is twice the value of a single resistor b.the equivalent resistance is the same as a single resistor c.the equivalent resistance is half the value of a single resistor d.the equivalent resistance is greater than that of a single resistor
22.)Which of the following modifications to a solenoid would be most likely to decrease the strength of its magnetic field? a.removing its iron rod core and increasing the number of coils b.increasing the current and reducing the number of coils c.reducing the number of coils and inserting an iron core d.decreasing the current and reducing the number of coils
23.)A stationary positive charge, Q, is located in a magnetic field, B, which is directed toward the right. What is the direction of the magnetic force on Q? a.toward the right b.up c.down d.there is no magnetic force
24.)According to Lenz's law, the magnetic field of an induced current in a conductor will a.enhance the applied field b.heat the conductor c.increase the potential difference d.oppose a change in the applied magnetic field
25.)How is a motor's mechanical energy able to perform mechanical work? a.mechanical energy is converted into electrical energy b.a current is generated by a rotating loop in a magnetic field c.electrical energy is converted into a magnetic force d.a shaft connected to a rotating coil is attached to some external device
26.)The rms current in an ac current is 3.6 A. Find the maximum current. a.5.1 A b.4.7 A c.2.8 A d.1.8 A
27.)Which of the following statements about electromagnetic radiation is true? a.it tranfers energy to objects in the path of the electromagnetic waves b.it can be converted to other energy forms c.it transports the energy of electromagnetic waves d.all of the above
28.) What causes the dark lines in the absorption spectrum of an element to occur? a.photons are absorbed when electrons jump from a higher- energy to a lower-energy state. b.photons are emitted when electrons jump from a higher energy to a lower energy state. c.photons are absorbed when electrons jump from a lower energy to a higher energy state. d.photons are emitted when electrons jump from a lower energy to a higher energy state.
29.)What is the speed of a 50 g rock if its de Brogile wavelength is 3.32 x 10^-34 m? (h=6.63 x 10^-34 j*s) a.40 m/s b.30 m/s c.20 m/s d.60 m/s
30.)What does the mass number of a nucleus indicate? a.the number of neutrons present b.the number of protons present c.the average atomic mass of the element d.the number of neutrons and protons present
32.) What daughter isotopes are produced when a neutron combines with a nucleus of 235 92 U? Assume that three neutrons are also produced in the reaction. a.140 56 Ba, 95 36 Kr. b. 142 56 Ba, 93 36 Kr. c.140 56 Ba, 93 36 Kr. d. 141 56 Ba, 94 36 Kr.
33.)Which interaction of nature binds atoms and moleclues by attracting unlike charges and repulsing like charges? a.strong b.weak c.electromagnetic d.gravitational
34.)If your image is 10.0 m from you in a flat mirror, how far are you standing from the mirror? a.10.0m b.20.0m c.1.0m d.5.0m
35.)If light waves are coherent, a.they shift overtime b.their intensity is less than that of incoherent light c.they remain in phase d.they have less than three different wavelengths
36.)Resultant forces on a charge is the ___ sum of the individual forces on that charge. a.scalar b.vector c.individual d.negative
37.)The amount of charge that moves through the filament of a lightbulb in 2.00 s is 2.67 C. What is the current in the lightbulb? a.5.34 A b.1.33 A c.0.835 A d.0.417 A
38.)Three resistors with values of 3.0 omega, 6.0 omega and 12 omega are connected in a series. What is the equivalent resistance of this combination? a. 0.58 omega b. 1.7 omega c. 7.0 omega d. 21 omega
39.)In a magnetized substance, the domains, a.are randomly oriented b.cancel each other c.line up mainly in one direction d.can never be reoriented
40.) Which conversion process is the basic function of the electric generator? a.mechanical energy to electrical energy b.electrical energy to mechanical energy c.low emf to high emf or vice versa d.alternating current to direct current
41.) According to the heisenburg uncertainty principle, which of the following occurs as soon as the exact location of an electron is known? a.the electron's exact energy is known b.the electron's spin becomes uncertain c.the electron's exact momentum becomes uncertain d. the electron's exact momentum is known.
42.)What are the components of natural radiation, in order from least to most penetrating. a.alpha, beta, and gamma b.gamma, beta, and alpha c.beta, gamma, and alpha d.alpha, gamma, and beta
43.)When bismuth-214 emits a beta particle, the remaining daughter nucleus is a.lead-213 b.actinium-215 c.polonium-214 d.bismuth-215
44.)An object is placed 20.0 cm from a thin converging lens along the axis of the lens. If a real image forms behind the lens at a distance of 8.00cm from the lens, what is the focal length of the lens? a. 5.71cm b. 12.0cm c. -13.3cm d. 13.3cm
Explanation / Answer
1)f= C/wavelength
f= 299,792,458/(6.0 x 10^-2)
f= 4.99 x 10^9 ? 5.0 x 10^5
2)
Angle of incidence = 90 - 30 = 60 degrees
And
Angle of reflection = angle of incidence = 60 degrees
3)
Use the mirror equation:
1/di + 1/do = 1/f
where di = +30 cm and f = +10 cm.
Substitute and solve for do.
1/do + 1/(30 cm) = 1/(10 cm)
1/do = 1/(10 cm) - 1/(30 cm) = 2/(30 cm)
do = 15 cm
4) blue
subtractive primary colors is a four-color printing process that uses cyan, magenta, yellow and black
5)Bent toward the normal
6)Since light can pass through a lens in either direction, a lens has two focal points
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.