Question
Which one of the following wave- lengths of light is
most effective in photosynthesis?Solution
Photosynthesis, process by which green plants and certain other organisms use the energy of light to convert carbon dioxide and water into the simple sugar glucose. The wavelength most effective in conducting photosynthesis is 420nm. Actually, 420nrn is on the blue side of the spectrum, which makes up between 1 and 10% of the light needed for photosynthesis.
A train has to cover a distance of 400 km in 25 hours. If it covers half journey in 3/5th time, then the speed of covering the remaining dist...
- A ball is dropped from a height of 120 metres. After each bounce, it rises to one-fourth of the height from which it fell. What is the total distance the b...
- Two bikers, ‘C’ and ‘D’, start from point ‘R’ and ‘S’ respectively towards each other. They meet after 7 hours, and biker ‘D’ has trave...
The aeroplane flies along a Square field @ 100, 200, 300 and 400 km/hours respectively. Then find the Average speed of the aeroplane during the whole jo...
The speed of two cars A and B are in the ratio of 10:13 respectively. Car A travels 18 km less than the car B in the same time duration. What was the di...
A car travels a distance of 810 meters in 36 seconds. If the speed of the car is reduced by 4.5 meters per second, how much time (in seconds) will it ta...
Two trains for Mumbai leave Delhi at 6 a.m. and 6:30 a.m. and travel at 100 km/h and 136 km/h respectively. Approx. how many km from Delhi will the two ...
The speed of a bike increases by 2 km/hr after every 1 hour. If the distance travelled by the bike in 1st hour is 35 km, the find the total distance tra...
On travelling with 30% less speed than his actual speed, Arjun reached the destination 2 hours late. Find the approximate time taken by him to reach his...
Krishna covers a certain distance by train at 25 km/hr. and the equal distance on foot at 4 km/hr. If the time taken by him for the whole journey be 5 ...