Hundreds of complex organic molecules exist in deep space, especially in the giant molecular clouds
Indicate whether the statement is true or false
TRUE
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The least important power of a telescope is _____
A) magnifying power B) light-gathering power C) resolving power D) reflecting power
The mass of the Sun is 2.0 × 10^30 kg, and the mass of a hydrogen atom is 1.67 × 10^-27 kg. If we assume that the Sun is mostly composed of hydrogen, how many atoms are there in the Sun?
a. 1.2 × 10^56 atoms c. 1.2 × 10^57 atoms b. 3.4 × 10^56 atoms d. 2.4 × 10^57 atoms
Two-Source Interference of Sound: Two speakers are placed side by side and driven by the same frequency of 0.50 kHz. If the distance from a person to one speaker is 5.0 m and the person detects little or no sound, which of the following is a possible the distance from the person to the other speaker? The sound speed in the room is 340 m/s.
A. 7.7 m B. 8.1 m C. 8.4 m D. 9.1 m
Photoelectric Effect: The work function of a certain metal is 1.90 eV. What is the longest wavelength of light that can cause photoelectron emission from this metal? (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 231 nm B. 14.0 nm C. 62.4 nm D. 344 nm E. 654 nm