Electrons are used to produce X-rays by allowing a beam of electrons to strike a heavy metal surface. When the intensity of the electron beam is increased, this results in:
A. X-rays being produced having longer wavelength
B. X-rays being produced having higher energy
C. More X-rays produced per unit time
D. Faster X-rays being produced
C. More X-rays produced per unit time
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The sun has a radius of 7 × 108 m and approximates a blackbody with a surface temperature of about 5800 K. Calculate the total rate of radiation from the sun and the emitted radiation flux per square meter of surface area.
GIVEN • The sun approximates a blackbody • Surface temperature (Ts) = 5800 K • Radius (r) = 7 × 108 m FIND (a) The total rate of radiation from the sun (qr) (b) The radiation flux per square meter of surface area (qr/A) PROPERTIES AND CONSTANTS he Stefan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4)
Instructions: On occasion, the notation 
will be a shorthand notation for 
.
Vectors 
and 
have equal magnitudes. Which statement is always true?
A.
+ = 0B.
- = 0C.
is perpendicular to + .D.
is perpendicular to+.E.
+ equals the magnitude of .For interference to occur, which of the following must be true?
1.The light sources must be in phase and of different colors. 2.The light sources must be out of phase and have different wavelengths. 3.The light sources must be out of phase and monochromatic. 4.The light sources must be in phase and the same wavelength.
Two sound waves traveling through the air have different frequencies. Consequently, they must also have different
a. amplitudes b. speeds c. wavelengths d. all of the above