The Hydrogen Maser. A maser is a laser-type device that produces electromagnetic waves with frequencies in the microwave and radio-wave bands of the electromagnetic spectrum. You can use the radio waves generated by a hydrogen maser as a standard of frequency. The frequency of these waves is 1,420,405,751.786 hertz. (A hertz is another name for one cycle per second.) A clock controlled by a hydrogen maser is off by only 1 s in 100.000 years. For the following questions, use only three significant figures. (The large number of significant figures given for the frequency simply illustrates the remarkable accuracy to which it has been measured.) (a) What is the time for one cycle of the radio wave? (b) How many cycles occur in 1 h? (c) How many cycles would have occurred during the age of the earth, which is estimated to be 4.6 × 10 9 years? (d) By how many seconds would a hydrogen maser clock be off after a time interval equal to the age of the earth?
The Hydrogen Maser. A maser is a laser-type device that produces electromagnetic waves with frequencies in the microwave and radio-wave bands of the electromagnetic spectrum. You can use the radio waves generated by a hydrogen maser as a standard of frequency. The frequency of these waves is 1,420,405,751.786 hertz. (A hertz is another name for one cycle per second.) A clock controlled by a hydrogen maser is off by only 1 s in 100.000 years. For the following questions, use only three significant figures. (The large number of significant figures given for the frequency simply illustrates the remarkable accuracy to which it has been measured.) (a) What is the time for one cycle of the radio wave? (b) How many cycles occur in 1 h? (c) How many cycles would have occurred during the age of the earth, which is estimated to be 4.6 × 10 9 years? (d) By how many seconds would a hydrogen maser clock be off after a time interval equal to the age of the earth?
The Hydrogen Maser. A maser is a laser-type device that produces electromagnetic waves with frequencies in the microwave and radio-wave bands of the electromagnetic spectrum. You can use the radio waves generated by a hydrogen maser as a standard of frequency. The frequency of these waves is 1,420,405,751.786 hertz. (A hertz is another name for one cycle per second.) A clock controlled by a hydrogen maser is off by only 1 s in 100.000 years. For the following questions, use only three significant figures. (The large number of significant figures given for the frequency simply illustrates the remarkable accuracy to which it has been measured.) (a) What is the time for one cycle of the radio wave? (b) How many cycles occur in 1 h? (c) How many cycles would have occurred during the age of the earth, which is estimated to be 4.6 × 109 years? (d) By how many seconds would a hydrogen maser clock be off after a time interval equal to the age of the earth?
Interaction between an electric field and a magnetic field.
Energy has dimensins mass times distance^2 divided time^2. In these expressions, m is mass, x is distance, t is itme, v is speed, and a is acceleration. Which expressoin as dimensions equivalent to energy?
mx^2/t
max
ma/t
max/t
mv^2/x
Which of the following statements uses exact numbers?
(a) 1 ft = 12 in.(b) 1 cal = 4.184 J(c) The height of Mt. Everest is 29,035 ft.(d) The world record for the 1-mile run, set by Morocco’s Hicham el Guerrouj in July 1999, is 3 minutes, 43.13 seconds.
A light-year is a unit of distance corresponding to the distance light can travel in a vacuum in 1 year. If the speed of light is 3.0 x 108 m/s, what is the length of a light-year in: (a) km? (b) Em?
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