What must be the resolving power of a grating allowing a spectral line at 683.80 nm to be distinguished from another line differing by 0.33 nm? (1 nm = 10?9 m)
a. 2,100
b. 46
c. 4,300,000
d. 230
e. 684
a
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Coil 1, connected to a 100 ? resistor, sits inside coil 2 . Coil 1 is connected to a source of 60 cycle per second AC current. Which statement about coil 2 is correct?
a. No current will be induced in coil 2. b. DC current (current flow in only one direction) will be induced in coil 2. c. AC current (current flow in alternating directions) will be induced in coil 2. d. DC current will be induced in coil 2, but its direction will depend on the initial direction of flow of current in coil 1. e. Both AC and DC current will be induced in coil 2.
What positive effect have supernovae had on the development of life on Earth? a. Supernovae are the main source of background radiation needed for mutations. b. Chemical elements necessary for life can only be formed in supernovae
c. The formation of the Sun was triggered by a supernova event. d. Planets form by accretion of material in the expanding remnant of a supernova. e. Neutrino bombardment was necessary to form the first simple proteins.
An object moves in a circle of radius R at constant speed with a period T. If you want to change only the period in order to cut the object's acceleration in half, the new period should be
A) T/4. B) T/2. C) T/ . D) T . E) 4T.
Specific heat capacity of ice = 2,000 J/kg-°C latent heat of fusion of water = 334,000 J/kg specific heat capacity of water = 4,000 J/kg-°C The 1 kg block of ice melts into water. The amount of heat absorbed by the ice as it melts is 334,000 J
a. True b. False Indicate whether the statement is true or false