The iridescent colours of soap bubbles are caused by interfering of (internally and externally) reflected light waves and are determined by the thickness of the film. This phenomenon is not the same as the origin of rainbow colours (caused by the refraction of internally reflected light), but rather are the same as the phenomenon causing the colours in an oil slick on a wet road.
If radius of a sphere is decreased by 48%, then by what percent does its surface area decrease?
A gets 30% of the full marks in an exam and fails by 90 marks. B gets 36% of the full marks in the same exam and he also fails by 72 marks. What is the ...
There were two candidate in an election. 15% of the total voters did not cast their votes whereas 10% of the casting votes were declared invalid. If the...
J's salary is 35% less than V's salary, then how much percent more or less is J's salary compared to G's salary, given that G's s...
A spent 36% and 25% of his monthly salary on food and rent, respectively. Of the remaining amount, he gave 25% and 40% to his mother and brother, respec...
A salesman is allowed 12% commission on the total sales by him and a bonus of 1% on the sales over Rs. 10000. If the total earnings of a salesman is Rs....
In a test comprising 200 questions, four marks are awarded for every question answered correctly. The number of marks deducted for every question answer...
In 2022, Priya's income was Rs. 18000, out of which she spent 45% and saved the rest. In 2023, if her income increased by 15% and...
In a city, the number of persons travelling by bike is 22.5% the number of persons travelling by metro. The number of persons travelling on foot is 40% ...
Suyash have total amount of Rs.3000 out of which, he spent 25% on food, 40% of the rest on travelling. Out of remaining amount he spends Rs.620 on misce...
