What is the energy of a photon that has the same wavelength as a 24 eV electron? (h = 6.63 × 10^-34 J×s, me = 9.11 × 10^-31 kg)
a. 24 eV
c. 3.5 keV
b. 14 × 10^-16 eV
d. 5.0 keV
D
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Sunspots are dark splotches on the Sun. Which statement is true?
A) They are hotter than the surrounding areas of the Sun. B) They are extremely cold objects, as cold as Pluto. C) They are extremely hot, but cooler than the surrounding areas of the Sun. D) They are solid bodies floating on the surface of the Sun. E) They are associated with areas of very low magnetic fields.
Consider a galvanometer with full scale sensitivity of 333. ?A and a coil resistance of 33. ?
(a) What shunt resistance is needed to make a 5.0 A ammeter? (b) What series resistance is needed to construct a 5.0 volt voltmeter?
Draw and label a simple diagram of the following:
a. a refracting telescope b. a reflecting telescope What will be an ideal response?
According to the special theory of relativity, which of the following happens to the length of an object, measured in the dimension parallel to the motion of its inertial frame of reference, as the velocity of this frame increases with respect to a stationary observer?
a. length increases b. length decreases c. length remains constant d. length vanishes to zero when velocity equals half speed of light