Question
Currently, the ages of 'P' and 'Q' are in the ratio of
4:9. 'Y' years in the past, the ratio of their ages was 1:3. Three years from now, 'P' will be half as old as 'Q' is today. Determine the value of 'Y'.Solution
Let the present ages of 'P' and 'Q' be '4x' years and '9x' years, respectively. ATQ: 4x + 3 = 9x Γ· 2 Or, 8x + 6 = 9x So, 'x' = 6 Present age of 'P' = 4x = 4 X 6 = 24 years And present age of 'Q' = 9x = 9 X 6 = 54 years ATQ; {(24 - Y) /(54 - Y) } = (1/3) Or, 72 - 3Y = 54 - Y Or, 18 = 2Y So, 'Y' = 9
Which property of a wave is related to its frequency?Β Β
Rain drops acquire spherical shape due to -
A device used for converting A.C. into D.C. is called β
A metallic conductor of circular cross-section has radius R. If current density varies as J = Jβ(1βr/R), the total current through the conductor is:...
A parallel plate capacitor is half-filled with a dielectric slab (K = 4). What is its effective capacitance, assuming plate separation d?
If the specific heat at constant pressure Cβ is greater than Cα΅₯ , the difference Cβ -Cα΅₯ is equal to:
What is the telescope designed to search for earth-size planets in the nearby region of our galaxy, termed as?
The threshold wavelength for a photoelectric surface is 540 nm. Will a light of energy 2.5 eV cause photoemission?
Which device is best suited for measuring the temperature inside metallurgical furnaces?
When do spring tides occur?
Relevant for Exams:
